B5 Systems SRK Stock Extension Kit - Adjustable Length of Pull

The B5 Systems SRK Extension Kit transforms standard rifle stocks into fully adjustable platforms for enhanced shooter comfort and accuracy. This precision-engineered kit extends length of pull by up to 1.5 inches, accommodating various body types and shooting positions while maintaining the structural integrity of the original stock design.

What Makes This Different

Unlike basic spacer systems that add bulk and reduce functionality, the SRK Extension Kit integrates seamlessly with existing B5 stock architecture. The modular design allows incremental adjustments in 0.25-inch increments, providing four distinct length settings. This system maintains full access to storage compartments and battery tubes while preserving the stock's original cheek weld geometry.

Key Features

• Extends length of pull up to 1.5 inches in 0.25-inch increments
• Machined from high-strength polymer with reinforced mounting points
• Compatible with B5 SOPMOD Enhanced and Precision stocks
• Maintains access to internal storage compartments
• Tool-free installation and adjustment system
• Black finish matches standard B5 stock coloring
• Preserves original cheek weld height and angle

Field testing demonstrates consistent performance across temperature ranges from -40°F to 140°F without dimensional changes or mounting point failure. The extension system proves particularly valuable for shooters wearing body armor, heavy clothing, or those with longer arm spans. Competition shooters report improved consistency in shooting positions, while tactical users benefit from adaptability across different mission profiles and equipment configurations.

Technical Specs

• Extension range: 0.25" to 1.5" in 0.25" increments
• Material: Reinforced polymer construction
• Weight: 2.1 ounces complete kit
• Compatibility: B5 SOPMOD Enhanced and Precision stocks
• Installation: Tool-free mounting system
• Color: Black (matches B5 standard finish)
• Package includes: Extension spacers, hardware, instructions
• Country of origin: United States

The SRK Extension Kit addresses length of pull issues without requiring complete stock replacement or permanent modifications. Professional armorers and serious shooters recognize this system as the most efficient method for customizing rifle ergonomics while preserving equipment investment and maintaining system reliability.