To fully maximize the usage of your Cry Havoc Tactical QRB (Quick Release Barrel) 2 Pin Upper Receiver Takedown kit for the AR-15 they offer these additional QRB 1 Pin Barrel Locking Plate Kits to allow you to swap different barrels on a single lower.
What to switch up between a 16” barrel and a 20” barrel in seconds while holding within 1 MOA? This kit makes that happen.
The QRB 2 Pin Barrel Locking Plate Kits can only be used on Barrels with a maximum outside diameter of 0.985"" and Free Float Hand Guards with a maximum width of 2.0"" Also the QRB will add 1.5"" to the length of your free-floating hand guard.
To purchase the proper kit simply selection the gas tube option that matches up with your barrels gas system length.
This kit only works if you already have a QRB 2 Pin Upper Receiver Takedown Kit mounted to your rifle, so if you don’t go on over to the complete kit product page first. "