The DOLOS Takedown Kit allows for quick seperation of the handguard & barrel from the upper receiver, resulting in an extremely compact & convenient package. Kits simply attaches to your pre-existing AR-15 barrel and is compatible with standard YHM free float handguards (Diamond, Tactical, etc). System works with standard AR-15 gas tubes and gas blocks. Once installed, user simply has to retract the bolt, insert the handguard, barrel & kit onto the upper reciever, turn the system 1/3 of a turn and you have an assembled upper receiver. Kit works great in conjunction with a LAW Tactical Folder for an extremely compact disassembled firearm. Comes with Mfg: Pantheon Arms