B5 Systems SIERRA K Stock – AR-15/M4 Carbine

The B5 Systems SIERRA K Stock delivers enhanced cheek weld and shoulder support for AR-15 and M4 pattern carbines. Its streamlined design reduces snag points while maintaining a stable shooting platform, improving control during rapid transitions and sustained fire. The minimalist profile suits close-quarters work and vehicle operations.

Constructed from reinforced polymer, the SIERRA K features a fixed-length design that installs directly onto mil-spec carbine buffer tubes. The anti-slip rubber buttpad provides secure shouldering in all conditions. Compatible with standard AR-15 lower receivers equipped with carbine-length buffer systems.

• Type: Fixed Carbine Stock
• Compatible Firearms: AR-15, M4 (Mil-Spec Carbine Buffer Tube)
• Material: Reinforced Polymer
• Finish: Black
• Adjustable: No
• Installation: Slides onto mil-spec carbine buffer tube, secured with buffer tube castle nut