Wilson Combat 1911 Auto 45 ACP Match Barrel and Bushing Set is constructed from a 17-4 stainless steel forging. There is the stainless steel bushing supplied. Both the barrel and the bushing are oversized slightly at lockup locations for final fitting as precise as a custom, hand built weapon. The finishing touches give this barrel the extreme accuracy you expect from Wilson Combat. The chamber requires finish reaming. The barrels are non-ramped and are hardened to RC 40. A 5 inch long barrel that is made in the USA.