Beretta AL 391 Instruction Manual
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3CONTENTSPage BASIC SAFETY RULES4 NOMENCLATURE8 DESCRIPTION10 TECHNICAL FEATURES AND DATA 12 OPERATION12 DISASSEMBLY16 ROUTINE MAINTENANCE17 REASSEMBLY18 SPECIAL MAINTENANCE21 MAGAZINE CAPACITY22 MOBILCHOKE® TUBES23 STOCK DROP AND CAST MODIFICATION24 RECOIL PAD25 REVERSIBLE SAFETY BUTTON262ENGLISHNOTICE: The Manufacturer and/or its Local Official Distributors assume no re- sponsibility for product malfunction or for physical injury or property damage resulting in whole or in part from criminal or negligent use of the product, im- proper or careless handling, unauthorized modifications, use of defective, im- proper, hand-loaded, reloaded or remanufactured ammunition, customer abuse or neglect of the product, or other influences beyond manufacturer’s di- rect and immediate control.WARNING: READ THE ENTIRE MANUAL CAREFULLY BEFORE USING THIS FIREARM. MAKE SURE THAT ANY PERSON USING OR HAVING ACCESS TO THIS FIREARM READS AND UNDERSTANDS ALL OF THIS MANUAL PRIOR TO USE OR ACCESS.WARNING: ALL FIREARMS HAVE LETHAL POTENTIAL. READ THE BASIC SAFETY RULES CAREFULLY AND UNDERSTAND THEM FULLY BEFORE ATTEMPTING TO USE THIS FIREARM.In addition to the Basic Safety Rules, there are other Safety Rules pertaining to the loading, unloading, disassembly, assembly and use of this firearm located throughout this manual. NOTICE: As the interchangeable barrel of this shotgun has a serial number different from that stamped on the receiver, it may be necessary, when refer- ring to the gun, to specify also the serial number of the barrel/s.Illustrations on pages 8, 9, 28, 29, 30
543. STORE YOUR FIREARM SO THAT CHILDREN CANNOT GAIN ACCESS TO IT. 3. It is your responsibility to insure that children under the age of 18 or other unautho-rized persons do not gain access to your firearm. To reduce the risk of accidentsinvolving children, unload your firearm, lock it and store the ammunition in aseparate locked location.Please note that devices intended to prevent accidents- for example, cable locks, chamber plugs, etc, - may not prevent use or misuse ofyour firearm by a determined person. Steel gun safes may be more appropriate toreduce the likelihood of intentional misuse of a firearm by an unauthorized child orperson.4. NEVER SHOOT AT WATER OR AT A HARD SURFACE. 4. Shooting at the surface of water or at a rock or oth- er hard surface increases the chance of ricochets or fragmentation of the bullet or shot, which can result in the projectile striking an unintended or peripheral target.5. KNOW THE SAFETY FEATURES OF THE FIREARM YOU ARE USING, BUT REMEMBER: SAFETY DEVICES ARE NOT A SUBSTITUTE FOR SAFE HAN- DLING PROCEDURES. 5. Never rely solely on a safety device to prevent an accident. It is imperative that youknow and use the safety features of the particular firearm you are handling, but ac-cidents can best be prevented by following the safe handling procedures de-scribed in these safety rules and elsewhere in the product manual. To further famil-iarize yourself with the proper use of this or other firearms, take a Firearms Safety Course taught by an expert in firearms use and safety procedures.BASIC SAFETY RULES1. NEVER POINT A FIREARM AT SOMETHING THAT IS NOT SAFE TO SHOOT. 1. Never let the muzzle of a firearm point at any part of your body or at another person. This is especially important when loading or unloading the firearm. When you are shooting at a target, know what is be- hind it. Some bullets can travel over a mile. If you miss your target or if the bullet penetrates the tar- get, it is your responsibility to ensure that the shot does not cause unintended injury or damage.2. ALWAYS TREAT A FIREARM AS IF IT WERE LOADED. 2. Never assume that a firearm is unloaded. The on- ly certain way to ensure that a firearm is empty is to open the chamber and visually examine the inside to see if a round is present. Removing the magazine will not guarantee that a pistol is unloaded or cannot fire.Shotguns and rifles can be checked by cycling or removing all rounds and by then opening the chamber so that a visual inspection of the chamber for any re- maining rounds can be made.
7610. AVOID ALCOHOLIC BEVERAGES OR JUDG- MENT OR REFLEX IMPAIRING MEDICATION WHEN SHOOTING. 10. Do not drink and shoot. If you take medication that can impair motor reactions or judgment, do not han- dle a firearm while you are under the influence of the medication.11. NEVER TRANSPORT A LOADED FIREARM. 11. Unload a firearm before putting it in a vehicle. Hunters and target shooters should load their firearm only at their destination. If you carry a firearm for self-protection, leaving the chamber un- loaded can reduce the chance of accidental dis- charge.12. LEAD WARNING. 11. Discharging firearms in poorly ventilated areas, cleaning firearms, or handlingammunition may result in exposure to lead and other substances known to causebirth defects, reproductive harm, and other serious physical injury.Have ade- quate ventilation at all times.Wash hands thoroughly after exposure.6. PROPERLY MAINTAIN YOUR FIREARM. 6. Store and carry your firearm so that dirt or lint does not accumulate in the working parts. Clean and oil your firearm, following the instructions provided in this man- ual, after each use to prevent corrosion, damage to the barrel or accumulation of impurities which can pre- vent use of the gun in an emergency. Always check the barrel prior to loading to ensure that it is clean and free from obstructions. Firing against an obstruction can rupture the barrel and injure yourself or others nearby. In case you hear an unusual noise when shooting, stop firing immediately, ingage the manual safety and unload the firearm.Make sure the chamber is free from any obstruction or possible bullet blocked inside the barrel due to defective or improper ammuni- tion.7. USE PROPER AMMUNITION. 7. Only use factory-loaded, new ammunition manufactured to industry specifications: CIP (Europe and elsewhere), SAAMI (U.S.A.). Be certain that each round you use is in the proper caliber or gauge and type for the particular firearm. The caliber or gauge of the firearm is clearly marked on the barrels of shotguns and on the slide or barrel of pistols. The use of reloaded or remanufactured ammunition can in- crease the likelihood of excessive cartridge pressures, casehead ruptures or other defects in the ammunition which can cause damage to your firearm and injury to yourself or others nearby.8. ALWAYS WEAR PROTECTIVE GLASSES AND EARPLUGS WHEN SHOOT- ING. 8. The chance that gas, gunpowder or metal fragments will blow back and injure a shooter who is firing a gun is rare, but the injury that can be sustained in such cir- cumstances is severe, including the possible loss of eyesight. A shooter must always wear impact resistant shooting glasses when firing any firearm. Earplugs help reduce the chance of hearing damage from shooting.9. NEVER CLIMB A TREE, FENCE OR OBSTRUC- TION WITH A LOADED FIREARM. 9. Open and empty the chamber of your firearm before climbing or descending a tree or before climbing a fence or jumping over a ditch or obstruction. Never pull or push a loaded firearm toward yourself or an- other person.
8NOMENCLATUREAReceiver A1 Trigger A2Reversible safety button A3 Trigger plate retaining pin A4 Breech bolt release-button A5 Carrier A6Carrier stop push-button A7Loading gate A8Breech bolt A9Cocking handle A10Extractor A11Breech bolt slide A12Connecting rod A13Locking block A14Firing pin A15Ejection port A16Cut-off BBarrel B1Barrel tangB2Gas cylinder B3Piston B4Exhaust valve assembly B5Valve assembly locking nut and counter-nut CStock C1Interchangeable butt plate C2Stock swivel C3Drop/cast spacers DFore-end D1Fore-end flange with exhaust port EMagazine tube FMagazine tube cap with shaft GOperating rod with sleeve HFront swivel IFore-end cap L1-round magazine capacity reduc- er plug MValve hook wrenches 912345678910
1110The design of the fiber-glass reinforced technopolymer receiver - stock spacer andof the stock metal plate allows one to adjust the stock drop and cast by simply modi-fying their assembly position. Different stock drop and cast dimensions can be ob- tained using the extra set of spacers supplied.STOCK DROP AND CAST SPACERSThe AL391 Urika is supplied with a modern design case and a complement of ac-cessories: 1-round magazine capacity reducer plug, spare recoil pad, stock drop andcast spacers, grip cap (wood stock field models only), stock swivels (field models on-ly), 25 ml. Beretta Gun Oil, valve hook wrenches and, for Mobilchoke®versions, a setof 5 choke tubes with special spanner.ACCESSORIESNOTICE: The AL391 Urika barrels are not interchangeable with those of for- mer models (AL 390, A 390 ST, A 304 etc.)The stock is designed to accept either a plastic butt-plate or a rubber recoil pad with-out any adjustment. By assembling rubber recoil pads of different thicknesses, one can modify the length of pull.STOCKThe skilfully rounded shape of the receiver promotes instinctive and quick target ac- quisition. The matted anti-glare black-finish of the upper and lower parts of the receiv- er highlight the bright finish of the sides to confer to the Beretta AL391 Urika a new appearance and distinctive character.DESCRIPTIONSTREAMLINED RECEIVER DESIGNThe unique gas operation system, with gas cylinder and self cleaning piston, is pro- vided with a self-cleaning exhaust valve which automatically expels the excess gas of the most powerful cartridges: The result is that the shotgun, without any adjustment , fires everything from the light 24 gr. (7/8 oz.) loads to the powerful 57 gr. (2 oz.) 3” Magnum 12 ga. shotshells. The exhaust valve assembly remains attached to the gas cylinder, thus allowing easy and quick disassembly and reassembly of the shotgun.GAS OPERATION SYSTEM WITH EXHAUST VALVEThe elastic recoil damper reduces stress from the impact of the breech bolt on the re- ceiver and absorbs part of the vibrations normally transmitted to the shooter.RECOIL DAMPERThe high strength fiber-glass reinforced technopolymer trigger plate offers many ad- vantages: Self-cleaning property, high absorption of vibrations and more comfort to the touch in cold weather conditions. The large opening of the trigger guard allows the use of gloves.TRIGGER PLATEThe cut-off control is positioned on the left side of the receiver: It can be engaged when the breech bolt is positioned in the closed position with the use of one hand. If the cut-off is accidentally left engaged, automatic reloading after the first shot will dis- engage it.CUT-OFF DEVICEThe cross-bolt safety button can be assembled for standard right-hand use or re- versed for left-hand use.REVERSIBLE SAFETY BUTTONThe AL391 Urika semi-automatic shotgun, 12 and 20 gauge, comes with the follow- ing features:
1312Assemble the barrel to the stock / receiver / fore-end assembly as follows:CAUTION:If, for any reason, the breech bolt is open and the fore-end is sepa- rated from stock / receiver assembly, avoid pressing the breech bolt release but- ton and be careful to keep your fingers away from the ejection port. Should the breech bolt release button be pressed in this condition, the breech bolt would slam forward and would stop only when the cocking handle hits theforward rim of the ejection port. This could damage both the handle and receiver.CAUTION: Should the breech bolt release button be pressed in this condition, the breech bolt would slam forward and would stop only when the cocking handle hits the forward rim of the ejection port. This could damage both the handle and receiver.CAUTION: While depressing the breech bolt release button to close the breech bolt, make sure that the cut-off is not inadvertently engaged. Should this occur, the breech bolt would be kept OPEN by the cut-off lever. In this case, always keeping your fingers away from the ejection port, close the breech bolt by operating the cut-off. (Fig. 12)lCheck the barrel. The bore and chamber must be clean and free from obstructions.l Unscrew (counterclockwise) the fore-end cap from the stock / receiver / fore-end assembly.(Fig. 1) l Pull the fore-end off the magazine tube.(Fig. 2) l Remove the piston. (Fig. 3) l Check that the carrier stop push button is completely depressed. If not, depress it completely. (Fig. 4) l Pull the cocking handle backward to bring the breech bolt in the OPEN position. (Fig. 5)l Insert the piston into the gas cylinder. (Fig. 6) l Partially slide the barrel tang into the receiver, taking care that the piston does not drop out of the gas cylinder and that the magazine tube cap shaft enters the piston hole as well as that of the gas cylinder and the valve assembly. (Fig. 7) l Slide the barrel tang home into the receiver. (Fig. 8) l Slide the fore-end into place over the gas cylinder, valve assembly and magazine tube. Check that the fore-end is perfectly centered on the receiver face. The fore- end is correctly assembled when there is no space left between the parts. (Fig. 9) l Place the front swivel ring (if desired and supplied) on the fore-end flange and com-pletely tighten the fore-end cap. (Fig. 10) l Close the breech bolt by depressing the breech bolt release button, keeping your fingers away from the ejection port. (Fig. 11)l Keeping the breech bolt retracted approximately 2 cm (1 inch), depress the trigger to lower the hammer. (Fig. 13)TECHNICAL FEATURES AND DATAGauge Barrel chamber Operation Locking system Receiver Barrel Rib Front sight Safety Magazine Stock, fore-end Length of pull Weight (approx.) *12, 20 2 3 /4 ” and 3” semi-automatic, gas operation with exhaust valve mounted on the barrel elevated locking block light alloy with recoil damper steel, chromium-plated bore and chamber ventilated metal bead; special front sight for competition models cross bolt, reversible for left-handed shooters 3 rounds (plugged to 2) selected walnut, checkered or high strength fiber-glass reinforced technopolymer. Adjustable drop. Cast-off or cast-on 362÷376 mm (14.25”-14.80”) (field) 365÷380 mm (14.37”-14.96”) (competition) From 3.000 Kg. (6.6 lbs.) to 3.300 kg. (7.3 lbs.) (12 ga. field versions) From 2.700 Kg. (6.0 lbs.) to 3.000 Kg. (6.6 lbs) (20 ga.) From 3.300 Kg. (7.3 lbs.) to 3.500 Kg. (7.7 lbs.)(12 ga. competition versions)(*) Weights are approximate, dependent on wood density and barrel length.ASSEMBLING THE BARRELOPERATIONWARNING: All assembly, disassembly and maintenance procedures should be carried out with the firearm unloaded (magazine tube empty, receiver empty and cartridge chamber empty). Check that the firearm is unloaded by looking through the ejection port, the loading gate and the chamber.WARNING:During the assembly, disassembly and maintenance procedures, never point a firearm at someone or at hard and flat surfaces. Treat the firearm as if it were loaded. (See points 1, 2 and 4 of the BASIC SAFETY RULES).The Beretta AL391 Urika semi-automatic shotgun is factory packed with the barrel separate from the stock / receiver / fore-end assembly.NOTICE: The numbers noted below refer to the photographs on pages 9, 78, 79, 80.
1514l To fire, disengage the safety and pull the trigger. l When the last round has been fired, the breech bolt remains open, thus signalling that the magazine is empty. (Fig. 19) l Engage the safety and, if required, reload the firearm as indicated.USE OF THE CUT-OFF DEVICEUNLOADING THE FIREARMThe cut-off device allows one to extract a live round from the cartridge chamber and lock the breech bolt open for safety or to replace the round in the chamber, without feeding a new round from the magazine.WARNING: The firearm is now loaded with a cartridge in the chamber and the safety is engaged. Never point a firearm at something that is not safe to shoot. (See points 1, 2 and 4 of the BASIC SAFETY RULES).WARNING: The firearm is loaded and ready to fire again. Make sure that the safety is fully engaged. Never point a firearm at something that is not safe to shoot. (See points 1, 2 and 4 of the BASIC SAFETY RULES).WARNING: The firearm is loaded and ready to fire. Always keep your fingers away from the trigger and keep the trigger free from any contact when you do not intend to fire. Never point a firearm at someone or at hard and flat sur- faces. (See points 1, 2 and 4 of the BASIC SAFETY RULES).NOTICE: If the firearm is to function properly, it is recommended that the cut- off be used as described above. In particular, it must be remembered that the breech bolt, when held OPEN by the cut-off, can be closed only by operating the cut-off lever.l Make sure that the safety is engaged. l Engage the cut-off by depressing the cut-off lever (round side). (Fig. 20) l Retract the breech bolt by means of the cocking handle to extract the live round from the cartridge chamber and eject it through the ejection port. At the end of its travel, the breech bolt is hooked into the OPEN position by the carrier which is locked by the cut-off device. Feeding from magazine is blocked. (Fig. 21) l Under safety conditions, insert the extracted cartridge or another cartridge into the cartridge chamber. l Keeping fingers away from the ejection port, depress the cut-off lever to close the breech bolt. (Fig. 12)l To fire, disengage the safety and pull the trigger.LOADING THE FIREARMWARNING: Before loading the firearm, practice the following loading proce- dures without the use of ammunition. Never handle a loaded firearm until you are fully familiar with the loading procedures. Before loading the shotgun, make sure that the safety is engaged. Always point the firearm in a safe direc- tion. (See points 1, 2 and 4 of the BASIC SAFETY RULES).WARNING: Always keep your fingers away from the trigger and keep the trig- ger free from any contact when you do not intend to fire.WARNING: When the safety button shows the red ring, the firearm is in the FIRE position.NOTICE:The safety can be engaged only when the hammer is cocked.NOTICE:The manufacturer assumes no responsibility for any injury or proper- ty damage resulting from improper or careless handling, intentional or acci- dental discharge of the firearm.CAUTION: Should the breech bolt remain open, check that the cut-off is not inadvertently engaged. If it is, always keeping your fingers away from the ejec- tion port, close the breech bolt by operating the cut-off button. (Fig. 12)WARNING: The firearm is now loaded and ready to fire. Always keep your fin- gers away from the trigger and keep the trigger free from any contact when you do not intend to fire. Never point the firearm at something that is not safe to shoot. (See points 1, 2 and 4 of the BASIC SAFETY RULES).l Retract the breech bolt by means of the cocking handle until it hooks into the OPEN position. (Fig. 14) l Engage the safety by pushing the safety button until the red ring disappears. (Fig. 15)l Insert the first round into the cartridge chamber through the ejection port. (Fig. 16) l Depress the breech bolt release button to lock the breech bolt, keeping fingers away from the ejection port. (Fig. 17)l Insert through the loading gate the other rounds by placing each round on the carri- er and pressing it down and forward into the magazine tube until it engages the stop tooth. (Fig. 18)
1716breech bolt assembly from the receiver. (Fig. 25) l The breech bolt assembly, no longer held by the operating rod, will divide into: (Fig. 26) l - breech bolt with firing pin, locking block, extractor, springs and pins;TRIGGER PLATEl Engage the safety (the hammer is cocked). l Depress the carrier stop push-button. (Fig. 4) lPush out the trigger plate retaining pin by pressing it with a drift punch or other simi-lar object. (Fig. 27) l Keeping the breech bolt release button pressed, extract the trigger plate by pulling on the trigger guard with a forward and downward movement. (Fig. 28)CAUTION: Further disassembly of the firearm is not recommended, unless carried out by a competent gunsmith.NOTICE: Wholesalers, dealers or gunsmiths (unless they are a Repair Station authorized by the Manufacturer and/or by its Local Official Distributors) are not authorized to make any Warranty repair or adjustment on behalf of the Manufacturer.ROUTINE MAINTENANCEWARNING: Check that the firearm is unloaded (cartridge chamber empty, re- ceiver empty, magazine tube empty). Check that the firearm is unloaded by looking through the ejection port, the loading gate and the chamber. If the shotgun is not unloaded, unload it as described in the chapter “Unloading the firearm”. Lower the hammer on the unloaded gun by pulling the trigger.WARNING: Never point a firearm at someone or at hard and flat surfaces. Treat the firearm as if it were loaded. (See points 1, 2 and 4 of the BASIC SAFETY RULES).WARNING: Excess oil and grease obstructing the bore even partially are very dangerous when firing and may cause damages to the shotgun and serious injury to the shooter and bystanders. Never spray or apply oil to the shotshells. Use lubricants properly: you are responsible for the proper care and mainte- nance of your firearm.When combustion residues, grease or dirt particles have accumulated in the action, clean and lubricate the firearm. Cleaning and lubrication of the shotgun after use is the best guarantee for protection of parts against corrosion deriving from combustion residues and from use of the firearm in humid or saline environments.At the end of the hunting or shooting day, perform the Routine Maintenance asindicated.l Pointing the firearm in a safe direction, check that safety is engaged (red ring cov- ered). l Engage the cut-off and retract the breech bolt to extract and eject the chambered live round. (Fig. 20-21) l Keeping fingers away from the ejection port, depress the cut-off lever to close the breech bolt. (Fig. 12) l Pressing down the carrier and at the same time pushing against the cartridge in the magazine, depress the breech bolt release button to ease exit of the shells from the magazine tube. (Fig. 22) l Check to ensure the magazine tube and receiver are empty. Disengage the safety. Be careful where you point the firearm, even though it might not be loaded. l Keeping the breech bolt retracted approximately 2 cm (1 inch), to allow a visual check of the cartridge chamber to ensure it is empty, depress the trigger to lower the hammer. (Fig. 13)DISASSEMBLYWARNING: Check the firearm is unloaded (cartridge chamber empty, receiver empty, magazine tube empty). Check that the firearm is unloaded by looking through the ejection port, the loading gate and the chamber. If the shotgun is not unloaded, unload it as described in the chapter “Unloading the firearm”. Lower the hammer on the unloaded gun by pulling the trigger.WARNING: Never point a firearm at someone or at hard and flat surfaces. Treat the firearm as if it were loaded. (See points 1, 2 and 4 of the BASIC SAFETY RULES).BARRELBREECH BOLTl Holding the cocking handle with the index or middle finger of the left hand, depress the breech bolt release button and allow the breech bolt to slide slowly forward until it stops. (Fig. 23) l Extract the cocking handle from the breech bolt slide. (Fig. 24) l Holding the stock / receiver assembly on a table with the loading gate facing up- ward, slide the operating rod sleeve forward off the magazine tube to extract thel Retract the breech bolt until it hooks into the OPEN position. (Fig. 14) l Unscrew (counterclockwise) the fore-end cap from the firearm and remove the front swivel, if mounted. (Fig. 10) l With one hand hold down the barrel and with the other hand slide the fore-end off the magazine tube. (Fig. 9) l Grasping the barrel and holding the piston inside the gas cylinder with the right thumb to prevent dropping it, slide the barrel assembly forward off the stock / re- ceiver assembly. (Fig. 7) l Slide the piston off the gas cylinder. (Fig. 6)
1918TRIGGER PLATEl Maintain as described for the breech bolt assembly.RECEIVERl Maintain as described for the breech bolt assembly. Lightly oil the slide rails of the breech bolt inside the receiver.MAGAZINE TUBEl Clean the outside of the magazine tube with a soft cloth sprayed with Beretta gun oil. l Carefully dry with a soft cloth and lightly oil the parts.Every 3000-5000 rounds (according to the type of ammunition used) and in anycase at the end of the hunting or shooting season, before storing the gun, in addition to the Routine Maintenance, perform the Special Maintenance as de- scribed later in this manual.REASSEMBLYWARNING: Check that the firearm is unloaded (cartridge chamber empty, re- ceiver empty, magazine tube empty). Check that the firearm is unloaded by looking through the ejection port, the loading gate and the chamber. If the shotgun is not unloaded, unload it as described in the chapter “Unloading the firearm”. Lower the hammer on the unloaded gun by pulling the trigger.WARNING: Never point a firearm at someone or at hard and flat surfaces. Treat the firearm as if it were loaded. (See points 1, 2 and 4 of the BASIC SAFETY RULES).TRIGGER PLATEBREECH BOLTl Reassemble the breech bolt slide with connecting rod to the breech bolt. (Fig. 36)l Operate in the reverse order to what is described in the chapter “Disassembly” making sure that the hammer is cocked, the safety engaged and the carrier stop push-button depressed. (Fig. 28) l Insert the trigger plate retaining pin, ensuring that the trigger plate hole is centered on the receiver hole. BREECH BOLT ASSEMBLYl Thoroughly clean the parts with a small brush and Beretta gun oil. l Carefully dry with a soft cloth and lightly oil the parts with Beretta gun oil.BARRELGAS CYLINDER, PISTON, MAGAZINE TUBE CAP SHAFT, EXHAUST VALVE ASSEMBLYl After use, thoroughly clean the barrel bore by passing a swab through it to remove combustion residues. If necessary, use a cleaning rod with bronze brush and/or a patch soaked in a bore cleaning solvent. l Thoroughly clean the barrel tang locking shoulder. l Pull a clean soft patch through the barrel bore. l Lightly lubricate the barrel bore by pulling through it a soft clean patch treated with Beretta gun oil.FORE-END FLANGEl Carefully clean the fore-end flange exhaust valve port with a soft brush sprayed with Beretta gun oil. Carefully dry the flange with a soft cloth.CAUTION: Do not apply excess oil: accumulation of oil attracts dirt which can plug the barrel and interfere with the functioning and reliability of the gun.CAUTION: Do not oil these parts.CAUTION: Magnum cartridges and particularly Super Magnum (3”) shotshells produce a high amount of combustion gases. The particular composition of some Super Magnum shotshells’ powder can generate a strong deposit of combustion residues. The parts of the shotgun which, coming into contact with the gases, are more affected by the combustion residues are the gas cylinder (inside) and the piston with its bushing.l Check that the piston slides freely inside the gas cylinder. l Carefully clean the inner side of the gas cylinder with a bronze brush sprayed with Beretta gun oil. l When all combustion residues are removed, clean the inside of the gas cylinder with a soft cloth. l Carefully clean the piston and check that the piston bushing can move freely in its housing. l If necessary, also clean the exhaust valve and the magazine tube cap shaft.Every 500-1000 rounds (according to the type of ammunition used), complete the Routine Maintenance with the following extra operations.