It depends on what your primary is. If it's a standard AEG like an Mp5 or an M4, I personally wouldn't want the Mp7 as a sidearm. It's too much like your AEG you're carrying already, and is rather bulky for its purpose. A friend is using his DMR (semi-auto only TM AUG) along with an Mp7 and really likes it though. If you're using an AEG that's shooting very long distances, then the Mp7 may be for you, otherwise I'd recommend a regular gas pistol.