B5 Systems SRK-1657 Sierra K Stock Coyote Brown AR-15/M4

The B5 Systems SRK-1657 Sierra K Stock delivers enhanced stability and comfort for AR-15 and M4 platforms in a compact, mission-ready package. This coyote brown stock combines proven military design principles with civilian shooting requirements. Built to withstand demanding conditions while maintaining consistent cheek weld and length of pull adjustment.

What Makes This Different

The Sierra K Stock features a streamlined profile that reduces snag points compared to bulkier alternatives. Its reinforced polymer construction provides the durability of military-spec stocks while weighing significantly less than aluminum options. The integrated QD sling mount positions at the optimal angle for two-point sling configurations, eliminating the need for additional hardware.

Key Features

• Mil-spec carbine buffer tube compatibility for drop-in installation
• Coyote brown finish matches FDE and tan color schemes
• Integrated QD sling swivel mount rated for 300+ pounds
• Reinforced polymer construction resists impact and temperature extremes
• Anti-rattle design eliminates stock wobble on buffer tube
• Textured buttpad provides secure shoulder contact
• Low-profile design reduces overall weapon length

Field testing demonstrates consistent performance across temperature ranges from -40°F to +160°F without material degradation. The stock maintains zero shift during rapid fire strings and sustained shooting sessions. Law enforcement agencies have adopted this stock for patrol rifles due to its reliability in vehicle-mounted configurations. Competition shooters appreciate the consistent cheek weld that supports accurate shot placement at extended ranges.

Technical Specs

• Weight: 8.2 ounces
• Length of Pull: Fixed at 13.5 inches
• Material: Glass-filled polymer construction
• Finish: Coyote Brown (CB)
• Compatibility: Mil-spec carbine buffer tubes
• QD Mount: Single integrated swivel point
• Country of Origin: Made in USA
• Warranty: Limited lifetime warranty

The SRK-1657 represents the intersection of military requirements and civilian practicality. Its proven track record in professional applications translates directly to enhanced performance for serious shooters who demand reliability without compromise.