This is a B5 Systems Stock known as the SOPMOD, model SOP-1074.
The B5 Systems Enhanced SOPMOD Stock is a tried and true design for ultimate comfort and accuracy. An official pick of the U.S. military" our Enhanced SopMod stocks have helped thousands of soldiers make the most of their skill in the field. From active engagements to shooting off rounds at the range" this stock enhances accuracy" precision" and fit. When you aren't worrying about wobble" slippage" and improper cheek weld" you can focus on what really matters: Taking your performance to the next level.
Features:
Fits all Milspec AR15 receiver extensions
Ergonomic cheek weld
No slip cushioned butt pad
Suregrip stock latch
Dual storage compartments