Magpul CTR Carbine Stock Mil Spec

The patent-pending Compact/Type Restricted (CTR) is a drop-in replacement for the standard M4 stock body. Designed for stability, the CTR utilizes a shielded operation lever and a friction locking system that secures the stock to the buffer tube for zero movement. Note: There are two types of buffer tubes (receiver extensions) in common use: Mil-Spec 1.14" OD and Commercial 1.17 OD. If you have a Commercial buffer tube on your rifle, make sure you order the Commercial CTR, stock number MAG311. LOP Adjust= 3.3 inch