I'm in the process of doing a 14.5" upper build. I've already attained a BCM 14.5" mid-length upper with a Daniel Defense Omega X 9.0 rail system and BattleComp 1.5 permanently pinned. I'm currently looking for a BCM lower assembly to buy either new or used in very good condition.
I've always felt the need to use the same manufacturer upper and lower receivers on my builds. To me, it just makes the rifle more "complete" and I've always assumed that fit between the two would be much nicer coming from the same manufacturer. But I know from experience that is not always the case as I have seen numerous builds where the upper/lower has some play between the two, not to the point where it will affect function.
Is that how everyone else feels too? Should it really matter if the upper and lower match as far as manufacturer? Does it make the rifle less desirable if it did not? I'd love to know everyone's opinion on this.


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