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Just don't try mixing a Colt upper/lower with non-Colt upper/lower. The pins/holes use for connecting the upper/lower are not the same size. As far as I know only Colt has the different sized pins/holes.
Just don't try mixing a Colt upper/lower with non-Colt upper/lower. The pins/holes use for connecting the upper/lower are not the same size. As far as I know only Colt has the different sized pins/holes.