The sierra k receiver extension 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.
B5 Srk Extention Kit Blk-SRK-1660
B5 Systems
Weapon Parts/Rifle Parts/Buffer Tubes / Kits / Buffers / Parts
MSRP:
$183.54
$128.95
(You save
$54.59
)
B5SRK-1660
814927024793
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