Took my most recent projects to the range today to test fire them. Ran two magazines through each of them with no problems. The first is a registered SBR with a Ciener .22 conversion on a lower that I built from an 80% Tannery Shop receiver. The M-4gery is a Stag Arms lower with a spaced Hogue grips, Trijicon parallax-free holographic sight, a flat-top upper with a carry handle, tactical charging handle, Chip McCormick competition trigger group. The FN is an Imbel with a DSA receiver. The three AKs are Romy kits that I built. The receivers are from scratch.