Back Assembly

Front Assembly
 
 
 

Manual

Introduction Congratulations on your purchase of your paintball gun from Proline Sterling. The Sterling has a reputation
unsurpassed within paintball, the Sterling is regarded as the finest pump paintball gun available World Wide. The Sterling is
manufactured from the finest aluminium and combining micro ground stainless steel internals it will give you many years of trouble
free use, each gun is thoroughly inspected and tested prior to leaving the factory. Caution: Do not operate your paintball gun
without eye protection. Do not charge the gun with a power source without having fitted a barrel plug first. Ensure any person
within your vicinity is wearing eye protection. Remember your gun has a range of over 200 ft (65 mtrs). Observe all Local Laws
and Guide Line. Your gun is not a toy and can inflict grievous injuries if safety rules are not adhered to. Keep out of the reach of
children. 4@@ Always use a Barrel Plug. 1.2

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The Sterling fires from a closed bolt on single shot. The Sterling also has rapid slam fire. Slam fire is when the trigger is held in and
for every manual pump cycle a ball will be discharged. To get your gun ready for use. First instaii a barrel plug so as to prevent
any accident due to a negligent or accidental discharge. Screw your cylinder into either the rear ASA (donkey) on a bronze or
silver or into the bottom line on a STP. Basic Operation Then connect your elbow and holder to the feed collar. Remember to
locate the elbow squarely to the feed collar. The feed collar has been designed to disengage from the body if struck by a strong
blow, this saves damage to the body. Your gun is now ready to fire. Pull the pump back until it stops this operation does two jobs
simultaneously, it allows a ball to drop into the breach and also for the pickup to engage the hammer. Move your pump forward,
the ball will be loaded into the breach and the hammer will be in the cocked position. Pull the trigger and your paintball will be on
it's way to your target. 1.3

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Adjustments Your Sterling can be used on various power sources, you can use liquid C02, C02 vapour (gas), compressed air, or
nitrogen. If you are using compressed air or nitrogen ensure your gun, cylinder and hoses are adequate for such use, only use a
recognised service centre for any alterations to your gun. Remember ALL POWER SOURCES are very high pressures and for
your safety strict adherence to guide lines are strictly recommended. To increase the velocity of your gun, remove the front mount
screw, disconnect the bolt rod from the bolt found at the rear of the body, now you can slide the pur-np, pump assembly together
with the bolt rod off of the barrel. Remove main spring from inside the lower chamber. Replace the main spring with one that is
slightly heavier in its compression. Now check your gun over a chronograph to measure the velocity. IMPORTANT. It is
recognised World Wide that the MAXIMUM safe velocity is 300 feet per second. To reduce velocity repeat the above, but
replace with a weaker compression spring. To ensure that the bolt is synchronised with the pickup, you must pull the pump back
to its stop position and look into the direct feed collar, the front of the bolt must have cleared the rear of the feed collar. This
position is set at the factory and should not need adjusting. 1.4

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For next sequence of adjustments you must remove the power source, or serious injury may occur. The valve spring is located
behind valve guide. Remove the rear mount screw. Pull out from the lower chamber the ASA donkey. Unscrew the brass valve
guide positioned at the front of the donkey, inside you will find an exhaust valve and spring. Ensure the sealing surface of the
exhaust valve is clean and free from any grit or swarf. By replacing the valve spring this will alter the dwell time. Dwell time is the
period of time the exhaust valve is open. The shorter the time (heavy spring) the more efficient your gun will be. Over springing the
valve will result in a decrease in velocity. A balance is required between the front main and the rear valve spring. Adjustments
Continued Alternatively: Variable velocity, dialable bolts are available from your local dealer as an optional extra. Optional Extras:
Dialable bolt:- Venturi Bolt:- Externally adjusts velocity. Spreads gas equally behind ball. 1.5

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Always make sure your barrel is clean and whilst playing during a days paintball, remove any gelatine residue with a damp swab
or cotton tail pull through. To remove barrel, turn counterclockwise and pull out from body of gun. If you have just serviced your
gun (see 1.8) and have oiled the internals, fire off 6 shots without paintballs. This will introduce oil into the barrel. This must be
cleaned out otherwise your accuracy will suffer. To clean barrel whilst connected to the body. Remove bolt rod from the bolt and
turn bolt rod counterclockwise 900. Pull out bolt from the upper rear chamber. Insert cleaning rod through rear body upper
chamber and clean through body and barrel simultaneously. Barrel Optional Extras- Brass Lined Barrel:- Helix Barrels:- 1 1 ", 13"
and 16" Barrels:- Micro Honed Finish for greater accuracy. Helps dispence excess C02 left in the barrel. Personal Choice 1.6

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Your Sterling will require little more than cleaning and regular lubricating. Always ensure your gun is clean and free from mud or
dust. Lightly oiled internals will give you a more consistent velocity. Special solvent cleaners, oil droppers and grease are available
from your dealers and we recommend Proline Sterlings own brand which has been formulated specially for Sterlings. To
disassemble your Sterling you need to remove both front and rear mount screws. This will detach the grip frame from the body,
remove ASA donkey from the body, now you will have separated the two parts. Disconnect bolt rod from the bolt, slide pump
over the barrel. Remove bolt from body, slide out hammer and spring from bodies lower chamber. You have now disassembled
your gun into it's main sub-assembled parts. Servicing Which are:- A. B. C. D. E. E Pump and Assembly ASA,@donkey and
valve, (with hose and grip on STP) Body and barrel BoltI Hammer and main spring Grip assembly with spacer bar 1.7

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(i). Pump Assembly requires only cleaning and light oiling. (ii). Body and barrel, clean out and lightly oil both upper and lower
chambers. (iii). Bolt, check 'O' rings clean and lightly oil, spare 'O' rings for bolt available in Sterling service kit. (iv). Hammer,
ensure SEAR has free movement, clean with solvent and lightly lubricate with oil. (v). Grip assembly requires only a few drops of
oil introduced around SEAR. The spacer bar which is mounted on the top of grip frame has a small round nitrile disc called a
spacer seal, ensure this is in place if not a spare is included in the service kit. (vi). ASA donkey has the valve guide and exhaust
valve with valve spring internally unscrew valve guide to reveal exhaust valve and spring, check exhaust valve and remove any
debris which may have embedded itself on the seal face. If you continue to get a leak of gas through the barrel you may have to
replace the exhaust valve. Servicing 1.8

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