I've only had problems with four lowers over the 8 years I've been building guns. Two were DPMS, one RRA and one Spikes.
Josh, just curious what were the problems with the DPMS lower, or the others for that matter? I ask because I have a complete DPMS rifle that seems to have a tight magwell, it works with all metal magazines that I have tried and but is too tight to allow the use of the Magpul 30 rounders without the window. I have not had that problem with either my complete Smith & Wesson MP15 rifles or a complete Smith & Wesson lower that I have. I never thought there was that much difference between different brands of lowers until I ran across that problem.
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