Works as it should - GG&G Mossberg 590 Sling & Flashlight Mount Combo

It fits well. Be careful not to rely on it instead of a shoulder stock, or it will cause it to loosen over time. Don't expect it to hold exact position while using your weapon either. It simply slides on after unscrewing your magazine cap. It's gonna slip a bit when dealing with turbulence, but it still shows no sign of coming off, even if you're a bit rough with it. You can carry reliably, and it holds a flashlight attachment. If you plan on replacing your magazine tube cap, this allows for a place to attach a sling in a similar (but not the exact same) position.