WOAH. Stop. There are differences in lowers. Some companies sell lowers that are forged incorrectly, have tight magwells, are misdrilled, or have material defects.
Not all lowers are created the same. Colt, BCM, LMT, and DD are pretty much the standard that all others are judged against. As far as I know, lowers from Mega, Aero, S&W, KAC, CMT, etc. (making a comprehensive list would be time consuming) are almost always good to go. It seems that with other brands it's hit or miss... CD lowers have a good reputation, but some early builds had tight magwells, which also appears to be the case with earlier models of Spike's lowers... I've also heard that some have an overly tight fit with the upper receiver, such as RRA lowers, but many people like that. Companies I have not heard good things about include Olympic, Superior, Vulcan, etc.




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