ended up not mattering but the thing where his gun didn't cycle because of the extra weight hanging off the barrel is also a solved problem with several options: use a different kind of handgun where the barrel doesn't need to move, use a little "booster" doohickey so the action doesn't have to move the whole mass of the suppressor to cycle, or tune all the working parts to account for the suppressor (and then don't shoot the thing unsuppressed because it'll have too much gas)