Saw this product and thought it was a GREAT idea for those of us that want to hunt in our AR15’s or AR10’s but live in semi-auto restricted areas. I’m a PA resident and have a 6.5 Grendel that id like to take a deer with. Now, I can. Plus, I live in a straight-wall only zone, so I can get a 350 Legend upper plus this key and have at it. Just thought this was cool and would share.