1911 Colt style Full length guide rod end cap for 6 inch long slide 1911 Colt style pistols – Carbon Steel with black oxide finish, These 6 inch end caps have a Shallow counter-bore so that any standard 5 inch recoil spring will work in ainch pistol. This allows for many more spring choices for your 6 inch pistols. CNC machined from Bar-stock.. No Mim, cast or tubing…. Professional gunsmith quality… Works with Full length one piece or 2 piece guide rod systems..