BJ TAC SB-style Stock (Dark Earth) Gas Pistols and Rifles Inner Barrels The knurled thread protector reveals

The knurled thread protector reveals standard 14mm Negative threads

This may vary slightly due to the threadlocker patch on the screw

This product is PTS Licensed Airsoft Replica for airsoft

easy to install

BJ TAC SB-style Stock (Dark Earth) Gas Pistols and Rifles Inner Barrels The knurled thread protector revealsThe BJ Tac SB style stock is designed to offer the pistol brace look for you to build your "pistol" style short barreled AR featured by many shooters in the United States due to fire arm regulations. The stock works much like standard stocks and works with standard buffer tubes found on both GBB as well as AEG M4s. Compatibility: M4 AEG Series Airsoft Guns M4 GBBR Series Airsoft Guns Includes: x1 BJ TAC SB Style Stock for M4 AEG GBBR Airsoft Dark Earth