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B5 Systems Sierra K Compact Receiver Extension Kit

MSRP: $135.00
$128.25
(You save $6.75 )
SKU:
B5016600
UPC:
814927024793
B5 Systems Sierra K Compact Receiver Extension Kit components displayed at angles SRK-1660

B5 Systems Sierra K Receiver Extension Kit

Proprietary Mounting System for Sierra K Buttstock

The B5 Systems Sierra K Receiver Extension Kit delivers premium build quality for your compact firearm platform. Specifically engineered to work with the B5 Systems Sierra K buttstock, this kit provides all necessary components for proper installation and optimal performance.

Highlights

  • Purpose-built for B5 Systems Sierra K buttstock compatibility
  • Reduced-length design for compact weapon builds
  • Complete kit includes all mounting hardware
  • Mil-spec materials and construction
  • 100% Made in USA

The Sierra K Receiver Extension Kit features a reduced-length, mil-spec diameter receiver extension machined from 7075 aluminum with 5 adjustment positions. The proprietary system includes a specialized short heavy buffer (3.5 oz) paired with an extra power spring to ensure reliable cycling in compact configurations. The included castle nut and quick disconnect end plate complete this premium assembly system.

Specifications

Component Material/Details
Receiver Extension 7075 Aluminum, Mil-Spec Diameter, 5-Position
Buffer Short Heavy Buffer (3.5 oz)
Spring Extra Power
Castle Nut Mil-Spec
End Plate Quick Disconnect
Compatibility Designed for B5 Systems Sierra K Buttstock
Origin Made in USA
Note: While designed specifically for the B5 Systems Sierra K buttstock, this kit may work with other stocks on the market. However, B5 Systems cannot guarantee proper function with non-Sierra K buttstock products due to its proprietary design specifications.