The Rainier Arms Rifle conversion kit includes all the components required to convert an existing pistol into a rifle, removing it from being subject to the ATF's new pistol brace rules should you not want to (or be unable to due to state law) register it as an SBR or shoot it without the brace.  

Rifle conversion kit includes:

• Rainier Arms Select 5.56 NATO Barrel - 16"
• Rainier Arms AR-15 Urban Combat Rail - 15"
• B5 System Bravo Stock - Black
• Gas Tube - Mid Length
• Gas Tube Roll Pin - 5 pack