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also, concerning the lower receivers breaking, i read this : if you strip the gun, you'll see a transparent pad installed at the rear of the receiver where the bolt transfers its weight during recoil. apparently these where not installed properly in the first PDWs and would fall out the gun, causing the bolt to impact directly on the metal, and with time causing the receiver to break because there was nothing to absorb the recoil. So they say, with this pad well installed and glued properly to the lower receiver, it shouldnt even be an issue.
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