Cry Havoc Tactical 223 QRB Barrel Locking Plate Pistol Calibers - Two Pin. Change calibers in seconds The QRB allows you to remove the barrel of your rifle or pistol quickly. NO drilling or modifications needed Fit your AR-15 Carbine or Pistol into a Backpack or Bugout Bag with ease. Perfect for discreet transport. Assemble and Fire in seconds even in low light. Able to KEEP strong hand on grip - Nothing to Depress or twist with strong hand. Use GROSS MOTOR SKILLS to assemble due to two piece gas system. No lining up tiny gas access hole with gas tube first Able to use a wide range of Free Float Hand Guards for the attachment of Back-up Iron Sights and accessories. Super fast barrel and upper cleaning The QRB is able to retain POA/POI as the barrel still ""head-spaces"" off the stock positions (our tests have shown accuracy retained to less than 1 MOA of original rifle setup). With the purchase of an additional Barrel Lock Plate switching to a different barrel length or caliber like the 300 Blackout takes just seconds" Specifications for Cry Havoc Tactical 223 QRB Barrel Locking Plate Pistol Calibers: Manufacturer: Cry Havoc Tactical Gun Model: AR-15 Color: Black Condition: New Last Chance: Yes Design: Two Pin Package Contents: Barrel Plate Receiver Plate Star Nut Receiver Plate alignment Pin Cry Havoc Tactical 793888120716: 223 QRB Barrel Locking Plate Pistol Calibers - Two Pin