Description
Description
- Proprietary mounting system designed specifically for Sierra K Buttstock
- Made of mil-spec materials and finishes for durability and reliability
- Easy to install with a secure fit for long-lasting performance
- Proudly manufactured in the USA with high-quality standards
The B5 SYSTEMS Sierra K Extention Kit is the proprietary mounting system for the Sierra K Buttstock. It consists of a reduced-length, mil-spec diameter, 7075 aluminum, 5-position receiver extension, a short heavy buffer (3.5 oz), extra power spring, castle nut, and quick disconnect end plate. All parts are made of mil-spec materials and finishes and proudly Made In The USA.
