I have a shotgun. It is a Remington 870 that was a vent rib and cut down before I got it. I added a Wilson Combat mag extension and a side saddle to it. The problem I have with it is in deployment. Primary HD is a Glock 19 with Surefire X300. Behind that is my AR. I can't find a reason to keep the shotgun. Can anyone tell me what it does that the AR does not.

I'm not looking to start a war, but am struggling with my own definition of purpose for this gun.

Thanks!