AR-15 LOWER RECEIVER VISE BLOCK Working on your lower receiver just got easier. 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. Speci Mfg: Brownells