Need advice. I bought a bushmaster (at the height of the frenzy) before I thought to do research unfortunately. After reading all of the information on this site and others I decided to upgrade the rifle, (BCM BCG, Mil-spec receiver extension, H buffer, Taller front site post, DD omega rail, Ergo grip, Toy BUIS and just got my eotech 512).I've been contemplating selling the original BM upper and buying a BCM upper mainly just for the 1/7 twist. It is only used for range and HD no courses or anything. I know with the upgrades I should be GTG reliability wise. Question is would it be worth the hassle trying to sell the BM upper, just to get the 1/7 twist (to be able to shoot 75gr. TAP) or should I just get the 60gr. TAP for Hd and not worry about it?