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Old 01-04-2011, 02:00 PM
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vietec vietec is offline
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Quote:
Originally Posted by Behindyou View Post
EDIT* I'm stupid, really. I felt the rails, and they were metal, but the upper receiver is plastic. I am RETARDED. Also, were you the person that modified the piston head? If so, what makes it "Modified"?
When someone modifies a TM piston head, they usually drill holes into the top half of the piston head where the mold breaks are. This is said to help air expand the O ring and create a better seal.
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