Deepfire mechbox shells -BAD!!!
I recently had a guy bring me one these $35 deepfire mech shells for his sig 552. It came with shims but no bushings or selector plate. No big deal.
The big deal was that not one hole on this shell (either side) was properly tapped or threaded straight. It is literally impossible to use this box without serious machining.
A terrible product. Unusable. Pay the extra for the systema.
Grand Poobah of T.W.A.T.