Springs get sprung. Detents get misplaced. Let's face it, losing a small part while working on your AR can put you and your rifle out of commission in a hurry. Unless you have replacements readily on hand. Grab this DoubleStar Tactical Bottle Opener and AR-15 Oops Kit and you'll always have back-ups for the small parts in your lower receiver. This value-priced combo includes a dual-purpose aluminum Sling Mount that functions as both a single point sling mount and handy bottle opener. Plus, you get a full AR-15 Oops Kit loaded with commonly lost or damaged small parts. It's a small investment that's sure to pay off big.