I've had a Gemtech Mossad II since 2017. I have several thousand rounds through it. Works great and just replaces the barrel nut so you dont need an adapter. The downside is, you cant use it on any other guns, and you cant take it apart to clean it. I bought a Liberty Mystic X and a Liberty Cosmic nad am happy with both. You can take them apart to clean and they are multi caliber.