Saber Tactical Avenge-X Bottle Chassis 6061 Aluminum Black Anodized Compatible with standard AR15 buffer tubes/stocks Includes adapter to allow for use of Avenge-X Tactical buffer tube and stock ARCA Rail M-LOK slots Picatinny bottom rail QD sling attachment Compatible with Avenge-X Bottle models Please note: If you are not converting an Avenge-X Tactical model, you will need to purchase an AR buffer tube and stock of your choice, as well as an AR compatible grip. Those items are not included with the chassis.