No issues at all. I've had one on a 12 ga 870 for about 10 years now...no problems. It does put the optic up forward, kind of like a scout mount. This forces the vision forward. Shoot with both eyes open and focus on the bird...fast and accurate. It shouldn't have much, if any, effect on the balance of the gun. There's very little weight to that sight/mount combo. You can order them from Natchez shooter's.