B5 Systems SOPMOD Stock Mil-Spec – AR-15/M4 Platform

The B5 Systems SOPMOD Stock delivers adjustable length of pull and cheek weld positioning for adaptable shooting positions and improved accuracy on AR-15 and M4 platform rifles. Its six-position Mil-Spec buffer tube compatibility makes it a direct replacement for standard carbine stocks, with dual water-resistant storage compartments for cleaning kits, batteries, or other small essentials.

Constructed from reinforced polymer with an anti-slip rubber buttpad, this stock installs on any Mil-Spec diameter carbine receiver extension tube. The adjustable cheek piece allows shooters to achieve consistent eye alignment with optics of varying heights, while the QD sling swivel socket provides secure single-point attachment. Coyote finish matches FDE and earth-tone rifle builds.

• Type: Adjustable buttstock with storage
• Compatible Firearms: AR-15, M4, and Mil-Spec buffer tube rifles
• Material: Reinforced polymer with rubber buttpad
• Finish: Coyote
• Adjustable: Yes (6 positions, plus cheek riser)
• Installation: Fits Mil-Spec diameter carbine buffer tubes