The CTR is designed to be a drop in replacement carbine stock body. This is a stock only. **Does not come in original Manufacturer's box, bulk packaged.** Adjustable for length of pull. This stock features a unique locking mech that friction locks the stock to the buffer tube for zero movement. Mounts on Mil-Spec AR15/M16 carbine receiver extention (buffer tube) (including; Colt, BCM(R), CMT, LMT, Vltor, Stag) New for 2009** Includes Magpul Buttpad! LOP Adjust= 3.5 inch Color: BLACK