The DBC Inner Bull Barrel Spacer Set for M324 Gen. 3 is designed to reduce the vibration of your 6.01mm DBC Inner Barrel. The M324 Gen. 3 outer barrel does not give the proper support for the inner barrel to attain the ultimate accuracy required for sniper rifles. This barrel spacer will, in addition to other accuracy upgrades, help make your gun as accurate as an airsoft gun can be.