The Block allows you to safely clamp on to your AR-15 upper receiver in a vise holding it securely without twisting, crushing or marring the finish. This Block is the perfect product for torquing a barrel on, removing a stubborn nut or for simple gun maintenance & cleaning.
• Durable design holds receiver securely
• Fits left and right-hand Mil Spec A2 upper, as well as flat top receivers
• Receiver insert with gas tube aligner included