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Mfg Item #: 156444
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 barrel nut or for simple gun maintenance and cleaning. It is made of a high pressure solvent resistant polymer material which can withstand almost anything you can throw at it. As an added bonus it includes a receiver insert with a gas tube alignment system making sure your gas tube is always in line when installing a barrel and torquing a barrel nut. Fits left and right-hand Mil Spec A2 upper as well as flat top receivers