XS Sights are, as the name implies, known for their sights. But the folks who work at SX Sights are shooters. This puts them in a position to use their manufacturing skills to make tools – other than sights – shooters can use, because, being shooters, they understand things shooters need.
This is just the case with their AR Armor’s Block which is designed to help you hold an AR upper in place while you do stuff to it. As you can see in the video it works pretty darn good and holds the upper receiver of Mossberg’s new MMR in place for scope mounting.
