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If your cousin is using a carbine upper...he needs to use a carbine buffer spring. Same goes if he's using a hydraulic buffer. Make sure the gas key on top of the bolt carrier is tight, and the gas key bolts should be preferably staked; to keep them from coming loose.
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That rifle hanging on the wall of the working class flat or labourer's cottage is the symbol of democracy. It is our job to see that it stays there."
--- George Orwell
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