These are precision laser cut Sorbothane ¬¨¬®? bumpers for airsoft gearboxes. These pads will greatly reduce the impact between the piston and cylinder. The pads can also be used to correct your AOE (Angle of Engagement) between your sector gear and your piston- a critical mod for prolonging your piston lifespan.
Fits ARES TAR-21, may fit other TAR-21 brandsPart# SPTXXXX