Brownells is dedicated to providing gunsmiths, armorers and gun owners with the right tools for the job, our AR-10/15 Lower Receiver Vise Block is no exception. Made from non-marring polymer, our vise block will hold a lower receiver securely featuring an anti-wobble feature in a bench vise, like the Brownells Bench Vise. Our Lower Receiver Vise Block uses a magazine catch groove and is compatible with most AR-10 and AR-15 lower receiver magazine wells. Changing lower platforms is as easy as flipping the vise block over. This is a must have for anyone serious about working on AR platforms.