Piston "O" ring?
i have a simple question, seein' how ive never taken apart an airsoft gun 'cept mine, i dont know this.....
how tight should the "O" ring on the piston be? i mean, should it be able to flop around on the piston a bit? the last time i tore my M4 down, it was like the "O" ring is kinda oversized, like a couple millimeters of slack, kinda looks expanded, kinda like when O rings get oiled with the wrong kind of oil, they'll expand.
im wondering if this normal? the piston is ported, so it looks like when its flying forward, the ports allow the ring to expand in the cylinder for a better seal.
thanks for any input....