After hundreds and thousands of shots, a piston head's o-ring will wear off, especially being in a hard-to-lubricate area. You can either replace the entire piston head, or the o-ring!
For Better Air Seal, Performance and Durability.
Fits all stock and ball bearing A.E.G. piston heads.
Fits all polycarb & stainless piston head.
Manufacturer: G&P
0-PT-ORINGx1