Originally Posted by
YVK
In fairness, I don't think anybody can say that KAC will "perform" better than BCM. What does "perform" mean? They will likely be equally reliable and equally accurate. In regards to weight, I am not sure KAC will definitely be lighter: it has lighter barrel profile and low-gas block, but BCM will have a shorter barrel with subsequent weight savings there. KAC is known for soft shooting properties, but midlength BCMs are very soft too. Last weekend I put 17 rounds (I don't know how to count) during VTAC 1-5 drill on 5 targets in just over 4 seconds; second time ever I ran that drill. This is with BattleComp, which is an option available when you buy EAG upper.
I don't believe for a second that anybody can say that KAC upper will "outperform" BCM EAG upper with any verifiable performance measurement backing, and I don't believe that this discussion is about performance. If performance is at question, then data from EAG tests, the filthy 14 etc., backs BCM as second to none.