dementlr
Active Member
I want to install a muzzle adapter on my C39 pistol to change the L14x1 threads to 5/8x24, end goal being to install an AAC 51T muzzle device. As shown in the pics, the adapter does not completely cover the original barrel threads. Do I need to use shims and a crush washer to fill the gap? It is a bit over 5.5mm wide, and there is a slight taper where the barrel meets the front sight.