I ran a Radian Comp Ramjet barrel combo on a Glock 45 Gen 5. The biggest drawback for me if you didn't remove the comp after each use for cleaning, it became removing it a chore. A friend didn't remove it for 800 plus rounds & had to soak the slide/barrel in break free to get the comp off the barrel. The FN 545 Comp by far the best comp design has a "push turn" toolless removal system which doesn't give you the problems like the Radian system. So, granted it looks cool, but for me, it's not something I would invest in. KG.