Crosstac AR-15 Modular Maintenance Block Kit w/ AR10/AR15 Receiver Blocks Black

Crosstac AR-15 Modular Maintenance Block Kit w/ AR10/AR15 Receiver Blocks Black. The Modular Maintenance Block Kit is the ULTIMATE block for your AR-15 / AR-10. This kit gives you multiple tools in one. This system holds an AR-15 upper on one side and an AR-10 on the other. This is the best holding method to torque barrels and is far superior to clam shell clamp designs. not only is it stronger but with one block you can fit all the different upper patterns including lefties Also included is a m