A bottle opener
Large-ish grip size for my large-ish hands.
I'm gonna stop you right there, you just said an AR-15 is a high-powered rifle. It is obvious you don't know anything about guns and I shall ignore anything you say from this point on.
Quality out of the box.
No need to start polishing parts and make things fit properly.
I like SIGs!
I like the decockers on my Sigs.