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good question:
checking the mp5 made me change the piston head's O-ring.
I remember checking the AUGs before putting the mechboxes back together, I don't recall any problem.But I wouldn't be 100% sure that the seal will be perfect in any situation...
one more important detail I forgot:
sometimes the AUG misfired recently:
-misfire
-2 bb go out the next shot.
it did that a few times...
mmm maybe the O-rings are dead.
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