AirArmss300

How to adjust and modify theAir Arms S300 & S310 S300 Tining Guide WARNING Important This guide is for owners who wish to dismantle their airguns and are reasonably good with hand tools. If after looking through this guide you don't feel competent enough to attempt the job, then have your gunsmith service/tune it for you. Reading through a few times will help you get the basic procedure. Needless to say that any work carried out by individuals will void any current guarantee. This should only be carried out if really necessary with the correct fitting tools. A spring compressor should be considered essential for safety reasons and certainly makes life easier. No responsibility can be taken by the author for any work carried out. Note that a spring compressor is not required for pre charged air guns. © JANUARY 2003. NO PART OF THIS PUBLICATION MAY BE REPRODUCED WITHOUT PERMISSION OF THE AUTHOR. MAKE SURE GUN IS NOT COCKED BEFORE COMMENCING WORK. EVEN THEN THE SPRING IS STILL UNDER TENSION, SO BE CAREFUL. THERE IS A LIMIT TO THE POWER OF AIRGUNS IN THE U.K. THESE ARE RESTRICTED TO 12ft. Ibs. FOR AIR RIFLES AND 6ft. Ibs. FOR AIR PISTOLS. GUNS EXCEEDING THESE FIGURES WILL REQUIRE THE OWNER TO OBTAIN A FIREARMS CERTIFICATE BEFORE CONVERTING AIRGUNS *OVER THE LIMITS STATED ABOVE. *This is only allowed by a registered firearms dealer. AIRGUNS WILL GENERALLY PERFORM BETTER AFTER RUNNING IN. IF YOUR GUN IS CLOSE TO THE ABOVE LIMITS, THEN HAVING YOUR GUN CHECKED REGULARLY CAN ENSURE THAT THE POWER HAS NOT SLIPPED OVER THE U.K. LIMIT. For Tuning Spring Airguns See the Airgun Tuning Manual by Gremlin. The Series S300 has been designed to be totally ambidextrous and can be changed from right hand to left hand operation without the need to purchase any special parts.S300 Tuning Guide The following is reproduced from the Air Arms Users Handbook. Never leave it in a cocked condition. . Do not pressurise beyond the stated maximum filling pressure. Do not allow excess lubricant to penetrate to the S340 striker rod as this will effect the consistency. Do not store the rifle in places subject to excessive heat. severe personal injury may result. Regular internal lubrication is not necessary. Argon. Nitrogen. If there is a requirement to check the trigger adjustment it is possible to test fire this rifle without a pellet in the barrel. Do not over-tighten. Never use any other gas particularly industrial or welding gases such as Oxygen. Insert the pellet into the loading groove. Acetylene. General Lubrication Regularly apply a few drops of gun oil to the loading bolt. stiff or noisy this could be an indication that lubrication is required and should be investigated. To cock the rifle hold securely in one hand and with the other turn the loading bolt and pull backwards until first restriction is felt. stripped threads will result from over-tightening. etc. Carbon Dioxide. However the mechanism needs to be completely disassembled to enable conversion. Do not store the rifle in a plastic or PVC type gun bag. The frequency of services is determined by the regularity of use but in all cases should be at least once a year. Do not attempt to dismantle when pressurised. Some parts are made of Aluminium. A small amount of grease is applied on assembly. Operating instructions. Hydrogen. Push the bolt forward and turn to lock. It is essential to wipe over the external surfaces of the rifle with a soft oily rag to maintain the high surface finish. General Maintenance Regularly check the tightness of all fixings. Reproduce with the kind permission of Air Arms The air cylinder is a highly pressurised unit and must not be modified or machined in any way. Do not attempt to pressurise if there are any large surface abrasions or dents. Silicone oil should never be used on moving parts. Important Information Do not store the rifle in a damp place such as a garden shed or garage. pull back again until trigger mechanism engages. and only use clean filtered compressed air. The rifle is now cocked and loaded and must be treated with caution. This should only be undertaken by Air Arms or a competent Gun smith. It is advisable to have this rifle serviced by Air Arms or a competent gunsmith. Re-lubrication will be unnecessary for a considerable time. If the operation of the rifle becomes rough. Failure to do this will result in surface corrosion. Usual safety precautions. Reproduce with the kind permission of Air Arms FILLING INSTRUCTIONS FROM COMPRESSOR 1. 4. . CHECK BLEED VALVE I IN CLOSED POSITION BY ROTATING IN A CLOCKWISE MOTION. PLACE END CAP ON RIFLE.S300 Tuning Guide The following is reproduced from the Air Arms Users Handbook. CONNECT RIFLE B TO BOTTLE CONNECTION A. 6. 2. 5. SLOWLY OPEN MAIN VALVE 2 BY ROTATING IN AN ANTI-CLOCKWISE MOTION. ROTATE BLEED VALVE 1 IN CLOCKWISE MOTION TO RELEASE AIR FROM CIRCUIT.WHEN GAUGE 3 SHOWS PRESSURE OF 190 BAR. 8. OPEN BLEED VALVE. THEN CLOSE MAIN VALVE 3 BY ROTATING IN A CLOCKWISE MOTION.(SEE ILLUSTRATION) BY SCREW HOSE TO RIFLE. UNSCREW HOSB CONNECTOR A TO RELEASE RIFLE FROM AIR CYLINDER. SWITCH ON COMPRESSOR AT POSITION 2. DISCONNECT RIFLE BY UNSCREWING HOSE FROM RIFLE. CONNECT RIFLE A TO COMRESSOR CONNECTION B. 6. FILLING INSTRUCTIONS FROM AIR CYLINDER 1. RIFLE MUST BE IN THE COCKED POSITION PRIOR TO FILLING. 8. CHECK BLEED VALVE 1 ON BOTTLE VALVE IN CLOSED POSITION BY ROTATING IN CLOCKWISE MOTION. RIFLE MUST BE IN COCKED POSITION PRIOR TO FILLING THE RIFLE. 2. 7. 3. 3. SWITCH OFF COMPRESSOR. 4. 5. UNSCREW END CAP FROM FRONT END OF RIFLE. REPLACE END CAP ON TO RIFLE. 7. UNTIL THE REQUIRED PRESSURE OF 190 BAR IS SHOWING ON THE GAUGE 3. UNSCREW END CAP FROM FRONT END OF RIFLE. ACB . Remember that small adjustments will make noticeable change to the operation of the trigger. If you have no experience in adjusting two stage triggers seek guidance or leave the trigger as set by the factory. Clockwise movement increases the weight of pull. Again clockwise decreases the length of first stage travel. The weight of the pull screw (A) is under the front of the trigger guard. There are three adjusting screws. The other adjusting screws are in the trigger blade. Trigger Adjustment INCORRECT ADJUSTMENT CAN MAKE THE RIFLE UNSAFE.S300 Tuning Guide The following is reproduced from the Air Arms Users Handbook. Be aware that adjustment to one screw will effect the adjustment of the other and the trigger will only work properly if there is the correct balance between the two. Clockwise decreases the pull-off point. Reproduce with the kind permission of Air Arms The trigger is a two stage trigger with adjustments on both stages. Screw (C) adjusts the length of first stage travel. Screw (B) adjusts the exact pull-off point Clockwise decreases the pull-off point. S300 Tuning Guide Reproduced with kind permission of Air Aims. . 5MM .22 CALIBRE BARREL 4. SCREW NYLON LOCKING PAD" BOLT HANDING PIN BOLT HOUSING/BODY SEAL CHASSIS COVER PLATE BARREL/BOLT HOUSING SEAL FILLING VALVE STOCK 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5335 5336 S340 S345 WEIGHT ADJ SPRING trigger TOP SEAR TRIGGER STOP PIN CHASSIS FIX SCREW SHORT BODY LOCATION SCREW CHASSIS PLATE SCREW BOTTOM SEAR CHASSIS PINS LONG CHASSIS PINS SHORT CHASSIS PIN O-RING LARGE CHASSIS PIN O-RING SMALL STRIKER • MAIN SPRING CYLINDER TUBE CYLINDER TUBE O-RING STRIKER GUIDE ROD SLEEVE S422 S425 S427 S430 S435 S440 S450 S455 S456 S456A S459 S460 S461 S465 S470 S475 S480 STOCK SCREW FRONT STOCK SCREW REAR STOCK SCREW WASHER MUZZLE END MODERATOR MODERATOR SCREW BONDED SEAL MALE SNAP CONNECTOR CAP RETAINING RING CAP .5MM .177 CALIBRE BARREL FIXING SCREW END CAP TRIGGER BLADE TRIGGER ADJ.S300 Tuning Guide SERIES 300 PARTS LIST 5300 5301 5302 5303 5305 5306 5307 5310 5311 5312 5315 5316 5317 5318 BOLT HOUSING BOLT HOUSING FIXING SCREW TRANSFER PORT ADJUSTER TRANSFER PORT LOCK SCREW & LOCK SCREW VALVE BODY SPRING FIRING VALVE SCREW AIR METERING STRIKER BODY CHASSIS BOX SCREW CHASSIS BLOCK TRIGGER GUARD TRIG GUARD FIX SCREW frt TRIG GUARD FIX SCREW rear WEIGHT ADJ SCREW trigger S350 S355 S360 S370 POT S380 S390 S391 S392 S400A S400B S405 S410 S420 S42I LOADING BOLT ASSY LOADING BOLT SCREW POT FIRING VALVE ASSY BRIDGE CLAMP FILLING VALVE BODY SPRING FILLING VALVE CIRCLIP FILLING VALVE BARREL 5. Fig 2 Important Notes . Solvents should not be used on the exhaust valve which may dissolve the plastic seal Remove the front stock and the rear stock screw as shown in Figs.S300 Tuning Guide A spring compressor is obviously not required for the Air Arms S300 precharged models Fig. 1 and 2. And should make it easier. Keep lubricants out of reservoir by degreasing / cleaning any new parts. The pressure listed on the instruction sheet with each gun I should never be exceeded Read the Guide thoroughly before attempting to dismantle the gun. This will allow the stock to be eased from the mechanism. 1. You do not need to release any air from the cylinder unless you intend to replace the valves or strip down the reservoir. but caution is still required as the cylinder is [charged with very highly compressed air of around 180 bar (around 2646 psi. Place the parts in a suitable container. This may prevent you from l taking apart assemblies that you don't need to. Try to keep the mechanism square as they are a fairly tight fit. S300 Tuning Guide Do not lose the small steel washer between the front stock screw and the bridge clamp. Remove the six Allen cap head screws on the rear bolt housing. 4. . C. The trigger unit is still held to the housing by two Allen screws. Note A shows the Fig. and one on the outside note C. Note. Note. one on the inside rear. 3 front Allen screw being removed. see note B. 4. Fig. When you remove the trigger guard don't lose the small spring that goes between the trigger guard and trigger unit. This small spring has to be replaced when the gun is assembled. Removing the trigger guard (not required for tuning). A. see fig. To remove the trigger guard undo the front and rear Allen screws. 5. Fig 5 Remove the Allen cap screw as shown in fig.S300 Tuning Guide After you have removed the the top screws in fig. Fig. The top bolt housing and barrel can then be lifted away from the cylinder. 6. 7. 6. the rear holding bolt can be removed from the rear of the cylinder as shown in fig. see fig. Then the rear striker body can be removed. 10 . 4. . This does not normally result in the gun giving a lot more power but the gun should be checked after any adjustments just to make sure it does not go over the legal limit. Fitting a stronger hammer spring will speed up Fi 7 g the lock time. 8. Fig.S300 Tuning Guide This will then allow the hammer spring and hammer to be removed as shown in fig. 11 . 8. 9. Make sure there is no Compressed air left inside the reservoir before you strip down the * reservoir. This will also give more shots than if the gun was set any higher. .When the valve body has been removed it is then possible to remove the exhaust valve and spring. The brass nut has an air flow restrictor which might have to be undone or removed if the gun is not producing enough power or you are putting it on FAC. Please note that the hammer has a slot at the rear. 10. Ibs. Before you undo the brass nut (pot). We have found the best FAC power to be around 18-22 ft. This is the Fig. 10. 9.S300 Tuning Guide Hammer and hammer spring being withdrawn from the rear of striker guide rod fig. 12 . this Fig. so long as there is still enough spring pressure to hold the exhaust valve shut. Leaving the brass pot undone slightly will also give more power. small grub screw shown in fig. the locking grub screw has to be slackened as shown in fig. If you are putting the gun on FAC then do not ~ set the power too high. Danger. 10. Normal waisted pellets cannot take too much power before the accuracy goes off. Also the trigger may have to be pulled when assembling the striker body. slot has to be lined up with the trigger sear when it is assembled. The valve body can be unscrewed from the reservoir (do not grip in a vice). 13 . Fig. Fig. 11. 12. Lubricants must not be allowed in the inside of the reservoir or on the internal parts that are under air pressure. 11. When fitting any new or used parts make sure there is no lubricant that can get inside. Only high pressure lubricants are permissible in tiny quantities.S300 tuning Guide After the locking grub screw has been slackened the brass valve retainer (pot) can be undone as shown in fig. 12. The internals have to be kept scrupulously clean to prevent leakage. shows the exhaust valve and spring removed. Fig. Molycote 33 can help if there is any need for a lubricant. 13. 13. 14. 14. 14 . The barrel is removed by undoing the two grub screws on the top of the bolt housing. Fig. Fig.S300 Tuning Guide Fig. Shows the exhaust valve and spring. See fig. shows the barrel removed. This is just held on by a small grub screw. Fig. 15. This can be pushed out from the front with a suitable probe.S300 Tuning Guide Fig. 16. Fi 15 S Fig. 16 15 . shows the method of removing the muzzle weight or silencer. There is an O ring seal left in the bolt housing. When the Allen screw has been removed then the pellet bolt. • If you need to look at the trigger then the side plate is held on by two slotted screws.S300 Tuning Guide An Allen bolt prevents the pellet bolt from being withdrawn. the bolt can be withdrawn rearward. Remove both screws as shown in fig. 17. It. 18. 16 . Fig. If you want to remove the pellet bolt then unscrew the Allen screw on the Fig 17 underside as shown in fig. 19. shows the trigger parts and their orientation. A smaller piece of silver steel is placed in the opposite side to mark the tool pin position as seen in fig. 19. 20. Drill the First small hole and place a pointed piece of silver steel in the tool. The filling valve body has two holes drilled either side of the filling hose thread (1/8 bsp). 17 . If you need to remove the inlet valve for any reason then you will have to make a tool to remove the front filling valve body. 20. Inlet Valve. Make sure there is no Compressed air left inside the reservoir before you strip down the reservoir.S300 Tuning Guide Fig. Fig. 20 . Danger. Fig. You start by drilling the large clearance hole for the filling thread as shown in fig. 21. Drill this second hole fig. pin.S300 Tuning Guide After marking a radius. as shown in fig. and fit the second Fig -21. centre punch exactly opposite the first hole. 22. 18 . ? 19 . When you have removed the filling valve body it is then possible to remove the inlet valve. The filling valve body is being removed in fig.S300 Tuning Guide The tool can then be used to remove the filling valve body. Fig. Fig. Fig. shows the inlet valve removed. 23. Do not remove valves just to see how it works. See fig. 25. you will need a fine pair of circlip pliers. 25. 23. 24. The circlip is squeezed inwards and pulled out. it is best done only when they are suspected of leaking. restricting the airflow. J Note for all guns fitted with a silencer. If you ever find that the accuracy has gone or you cannot zero your scope. The transfer port is partially blocked by this small grub screw. Note the UK limit is 12-ft. see kit.lt has been found that in half the cases mentioned above. 20 . 27. This can give a faster hammer action (lock time) but can also increase the power.S300 Tuning Guide Fig. turn the housing onto the scope rails. Assembly of the S300 is basically the reverse of the dismantling process. so it is important not to exceed this level if the gun is not on FAC. After any adjustments it is important to check the power on a chronograph to make sure it does not exceed the legal limit if you do not own a FAC. It is just a matter removing the pin from one hole and replacing it in the opposite one. Avoid hitting the exhaust valve too hard. Ibs. I To remove the pellet bolt. this will then allow you to adjust the small master adjusting grub screw. And don't forget to replace the washer between the stock and mechanism. Shows the method of changing the bolt from right hand to left hand. Fig. see previous mention on page 10. then check that the transfer port has not been blocked by the O ring that is fitted between the barrel and reservoir. it is worth trying the gun without the silencer. it was found that it was the silencer off centre.. The exhaust valve is stronger than most Precharged so this should not be such a problem. To speed up the lock time it is possible to use a slightly stronger hammer spring. Ibs. If power is found to be low. To lower or increase the power of the S300 first remove the small locking grub screw. this will give access to the Alien screw on the underside. 26. 27. The power limit in the UK is 12 ft. as excessive striking could bend the exhaust valve. See page 8. but pay particular attention to the small spring that goes between the trigger guard and trigger unit if you removed it. Unscrew a little at a time to give a small increase in power or screw in to lower power and keep the faster lock time. Important: Fig.