This brings up a related question I have and maybe one of you have some experience or advice: I have a AAC TiRant 45 waiting for the stamp (so I don't have the suppressor with me)-I bought all the pistons available so I can use with my MK23, USPc 45, USP 45 Tactical, USP 9mm SD and MP5 (Turner clone with 3 lug). When I put in the proper piston for the MK23 it screws down all the way that it touches the front of the slide and if I tighten until it is tight on the thread it rubs up against the slide-on all the other pistols (with the proper piston for them) there is a gap where the threads end and the front of the slide is so it does not get close to the slide. Anyone with a MK23 and AAC TiRant that can give me advice? I am not a member on any other forums or silencer forums and since I saw this related post figured someone HK might could help-thanks I advance!