The loading lever hook jumped off my ASM colt army and everyone was out of stock on a replacement part and craxy on the shipping so I got another ASM barrel off EBay for 30 something. When it arrived it was well abused and needed a lot of fitting, dressing out peen marks from screwdriver blade vs. wedge, and enlarging diameter of the arbor well with dowel and emrycloth. Then the cylinder would not turn until I worked the barrel cone down some. Now my question is how much clearance is needed? The cylinder turns nicely and I can see a sliver of light between. I haven't measured it but I would guess around the short side of five thousanths. I put a few rounds through it and it shoots fine, even truer than the original barrel that shot more high and to the right than I was comfortable with.