Making a GB-22 Barrel from a cut off AR-15 barrel leaving #3dprintedguns

Repurposed Left overs from cutting down a 16" AR-15 barrel to 10.3" The original 3d printed GB-22 calls fir a somewhat uncommon 3/8" liner. So I made one. Since the stub was already threaded, the right choice was to cut around them leaving a solid shoulder for a suppressor to register.