Description: This listing complies with eBay's air gun guidelines found here and I will only sell and ship air guns to buyers in jurisdictions where permitted by applicable laws - http://pages.ebay.com/help/policies/firearms-weapons-knives.html This is the Magnum Airpower ADJUSTABLE CUP-SEAL PISTON for 1377, 1377C, P1377, 1322, 1322C, P1322, Drifter, 2289G Backpacker and PC77. The piston head and locking collar are machined from 7075-T6 aluminum, one of the strongest of all commercial aluminum alloys, stronger than many types of mild steel and stainless steels only much lighter. The custom piston pin is machined from tool steel with radiused ends to match the internal tube contour, this reduces scoring and makes pumping smoother. The piston-base is machined from Delrin for ultra-smooth function and to act as a compression-buffer to help protect metal parts from excessive stress. The piston rides on the Delrin base and cup-seal with no metal-to-metal contact to reduce scoring, wear and work smoothly. Once the piston is adjusted to length, snug the locking collar down with a pair of soft-jawed pliers while holding the base with a 3/16" pin punch or similar tool. Thick strips of folded paper, cardboard or leather can be wrapped around the locking collar to keep it from being marked by standard steel pliers. It's not necessary to torque the collar extremely tight, just snug it down moderately for the best overall function. If the piston is adjusted too long it won't allow air to enter the tube when the pump lever is in the open position, if the gun won't pump up then this may be the cause. INSTALLATION : The piston needs to be adjusted correctly to work well and avoid damaging the gun. On the first pump (no pressure in the tube or valve) the forearm should close with moderate resistance, not need to be forced. Once it's adjusted to close without forcing it, fire the air out of the valve and without opening the forearm all the way check how much clamping force it has with no pressure in the tube. The piston should compress against the valve face with light to moderate clamping force to hold the forearm up snugly. After making an adjustment, fire the air out of the valve before checking it again. Always make sure the valve port, or barrel if the gun is assembled, is pointed in a safe direction before firing the valve, the air pressure is strong enough to cause injury even when the gun is unloaded. LUBRICATION : Variable-pump models should be assembled with oil to lube all the seals and moving parts. Add a drop of oil directly into the pump chamber every couple hundred shots. You can do this more often if the piston isn't working smooth or produces inconsistent performance. If you accidentally over-oil you can fire the gun with the barrel pointed straight up, unloaded and safely away from you. In that position excess oil settles near the valve stem and blows out through the barrel. To prevent oil-lock, only use two pumps for each shot until excess oil is cleared from the pump chamber and valve. A drop of oil should be applied to all pivot points of the pump lever and one at the back of the piston seal. This will lubricate the contact points of the piston.
Price: 47 USD
Location: West Hatfield, Massachusetts
End Time: 2024-08-01T15:24:14.000Z
Shipping Cost: 10.4 USD
Product Images
Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Non-Domestic Product: No
Brand: Magnum Airpower
Custom Bundle: No
MPN: Does Not Apply
Modified Item: No
