Excellent upper/pic rail vise block - Wheeler Engineering Delta AR Upper/Pic Rail Vise Block

Used with the picatinny Rail. this vise will securely hold your AR Upper Receiver in place for servicing. I would recommend using the Rail Mount Side, which is much more secure over the tabs on the upper, which could break under high tension. Use it in conjunction with a Reaction / Upper Receiver Rod to hold barrel in proper alignment while servicing the barrel or muzzle device.