This is the strongest production AR15/M16 stock available! Approximately 6 times stronger than an A-15 A2 stock & receiver extension tube. Ideal for CQB or breaching doors, and without the fear of bending the receiver extension tube (which disables the rifle). Adjustable length of pull, adjusts from 7.5" to 9.5" in five 1/2" increments. The AP4 SOCOM comes with extra hardware so that it can be set up as a push button quick adjustable stock for "pre-ban" or "exempt" use; or as an adjustable stock for post ban use! (AP4 SOCOM has not been approved by the BATF for post ban use).