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B5 Systems Sierra K Receiver Extension Buffer Tube Kit Black
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Includes a Short Heavy Buffer (3.5 oz), Extra Power Spring, Castle Nut and QD End Plate.
Reduced-length 5-position Receiver Extension Constructed of 7075 Aluminum
Specifications
Brand
Model
Series
Extension Kit
MPN
SRK1660
UPC
814927024793
MSRP
$135
Weight
3.5 oz
Fits
Sierra K Buttstock, AR-15 mil-spec
Color
Black
Material
7075 aluminum
Description
The B5 Systems Sierra K Extension Kit is a black buffer tube assembly for AR-15 rifles, designed to mount the Sierra K buttstock. It is intended as the proprietary mounting system for that stock and is not described as a general-purpose replacement for other buttstocks.
The receiver extension is machined from 7075 aluminum to mil-spec diameter and uses a reduced length with five stock positions. The kit includes a short 3.5 oz buffer and an extra power spring, and all components are described as made from mil-spec materials and finishes.
The package also includes a castle nut and a quick disconnect end plate, so the parts needed to install the buttstock on the buffer tube come together in one set.
- Brand: B5 Systems
- Model: Sierra K Extension Kit
- Platform: AR-15
- Fits: Sierra K Buttstock, AR-15 mil-spec
- Material: 7075 aluminum
- Color: Black
- Weight: 3.5 oz
- Positions: 5
