Vism Upper Receiver Block for AR-15 Rope & Chain Forty yards has long been

Forty yards has long been the standard by which all turkey loads were measured

Extended Ledge for one-handed manipulations

Prone Model 7

3/16-24 and 1/4-20 thread bushings

Vism Upper Receiver Block for AR-15 Rope & Chain Forty yards has long beenThe Vism Upper Receiver Block is designed to fit AR15 and M4 receivers to help with assembly and general maintenance of AR receivers. The modular upper receiver block can be used in several ways for many different maintenance tasks. You may use just the lower half of the block by attaching it quickly to the upper receiver with the two provided receiver pins. This allows you to clamp the AR upper receiver to a vise for maintenance work. Bolting the two