NcStar VISM AR-10 Upper Receiver Block VTHAR10UVB kbar providing correct eye relief and

providing correct eye relief and head placement when used on your rifle

Alleviates neck strain during long days in the field

diameter -Lightweight nylon kernmantle rope -500 feet of Para cord spool

Whether you are expecting close engagement with wild hogs or burning up ammo at the local range

NcStar VISM AR-10 Upper Receiver Block VTHAR10UVB kbar providing correct eye relief andBolting the two halves of the upper receiver block fully supports the upper receiver to prevent damage from torque twisting forces when installing or removing barrels from the receiver. The upper half of the block inserts into the AR10 receiver just like a bolt carrier group. The bottom half of the block can be bolted together with the upper block half with the provided steel bolts. This fully supports the inside and the bottom of the AR10 receiver