I recently “fit” a nighthawk drop in threaded barrel to a kimber custom ii. Didn’t take much to make it fit well and has great lock up when manually cycled. The gun fires, ejects and loads fine with no indication of odd wear after a few mags. This is with an 18 lb recoil spring. I threaded a piston and an octane .45 onto and it fails to go into battery completely after being fired, short by approximately one 1/16th of an inch. Swapped to a 22 lb spring and it’s a little better, only takes slight pressure on the rear of the slide with my thumb to go back into battery. It’s close enough that it fires a second round (I know, only did it once) but not a third. I’m wondering what spring weight anyone else is using with their suppressed 1911 or of anyone has any similar experience with suppressed 1911’s in .45 acp. I’m also thinking it could possibly be an issue with the weight of the suppressor or barrel but haven’t tried any other bushings that are a little more open on the barrel. I may also try a different slide stop or fitting/sanding the radius of the bottom lugs a little better.
Thanks,
Brent