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Restore compression to your KWA AEG or RM4 ERG with this complete, pre-greased piston assembly. The A-7 piston comes with billet aluminum piston head installed.
Automatic Electric Gun (AEG), Electric Recoil Gun (ERG)
KM4 KR Series, KM4 SR Series, RM4 PTS CQB, RM4 PTS Scout, RM4A1
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