Bought a Davidsons Defence LH upper Delta Team Tactical, 16 inch 1-7 twist no dust guard, no forward assist somewhat rough in the bolt race. I bought it assembled and test fired. Like the idea of a LH upper for safety. Will see how it shoots and functions. Barrel looks good to my old eyes. Put lock tite on gas block screws, and checked everthing. It was test fired and included 3 brass, tough to rechamber fired brass?