The B5 Systems Sierra K Receiver Extension in Wolf Gray is a lightweight, fixed polymer stock and receiver extension combo designed specifically for use with the B5 Systems Sierra stock system. Built for shooters who value minimalism, strength, and seamless integration, this component replaces the need for a traditional buffer tube while offering a compact, durable solution for AR-platform rifles and pistols. Its sleek Wolf Gray finish adds a modern, subdued tone ideal for tactical and duty builds.
Molded from high-strength polymer, the Sierra K Receiver Extension is both durable and weight-efficient, featuring internal structural reinforcement for stability. The integrated design reduces profile bulk and snag potential, making it well-suited for PDW-style or low-visibility applications. The Wolf Gray coloration pairs perfectly with other gray-tone B5 accessories, offering both aesthetic cohesion and rugged field performance.
B5 Systems Sierra K Receiver Extension Specifications
Manufacturer: B5 Systems
Model: Sierra K Receiver Extension
Fit: B5 Systems Sierra Stock
Color: Wolf Gray
Material: High-strength polymer
Type: Fixed stock/receiver extension hybrid
Design: Lightweight, low-profile construction
Application: AR-15 rifles and pistols configured for Sierra K compatibility
More Information
Condition
New in Box
Finish Per Color
Wolf Grey
Manufacturer
B5 Systems
Manufacturer Part Number
SRK-1659
Model
Sierra K Receiver Extension
Type
Stocks
UPC
814927024786
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
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