Looking for part that snaps onto a spare upper for storage
A few days ago I was on some AR company website and they had a part that I'd been thinking of in my head for a while. Now I can't remember where I saw it and I'd like to buy it. It was a simple peice of black plastic that snapped onto the AR upper where the lower snaps on. It helped keep dust and dirt out of the upper and it kept the BCG and charging handle in. I remember that it was only about $10 each. In my search for this I found one that uses two little pins that go in like the reciever pins, but the one I'm looking at didn't have those. Just a real quick snap on/snap off. Does anybody have a clue what I'm talking about? Thanks.