You got an out-of-spec, factory, SBR lower. Tuff luck (really), but that is a QC issue. It is not like the Gen 2 or Gen 3 lowers are designed to a different spec in function critical dimensions. A flared magwell and integral trigger guard are not function critical divegance from mil-spec.



), but that is a QC issue. It is not like the Gen 2 or Gen 3 lowers are designed to a different spec in function critical dimensions. A flared magwell and integral trigger guard are not function critical divegance from mil-spec.

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