This Handguard is all you need to make your Barrel Quick Detach. Any AR-15 barrel will work. Just make sure your barrels gas length and Gas block are configured in a way it wont conflict with the handguard. For instance, if your using a low profile gas block you are good no matter what. If you are using a high rise or A2 style gas block you have to make sure the gas block is AFTER the end of the handguard.