Take the bolt carrier group, for example. Hogged out of a piece of aluminum bar stock, the SPC223’s upper receiver features steel reinforcement points. The remaining steel served as an impact face for the rear of the piston or op rod. The B&T SPC is a very competent, highly refined design which demonstrates excellent attention to detail. Both red dot and magnifier appear to have good-quality mounts, something which is never a given in this price range.