Top Stop Upper Receiver Cover Polymer Black

It snaps right on and keeps the BCG from falling out of the upper. Even worked on the CMMG with the radial delayed system on the 9mm. Highly recommend this product.

Works well for keeping my other uppers clean and together until use buying more for rest of my uppers good product no complaints from this guy appreciate the craftsmanship

I ordered both the black and yellow Top Stop. 3 total. All 3 are too loose on most on the rear takedown lug. I had to use Ranger bands to keep the dust covers on. When they do fit, it's got a nice positive click on the rear takedown lug. I wish the mould was a little longer on the detents that fit inside the rear takedown lug so you can simply shave them down if the Top Stop as too tight. Better than being too loose.