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The Sierra K Receiver Extension Kit is a proprietary mounting solution engineered specifically for the Sierra K Buttstock. The kit includes a reduced-length, mil-spec diameter 5-position receiver extension machined from 7075 aluminum, along with a short heavy buffer weighing 3.5 oz, an extra-power spring, a castle nut, and a quick-disconnect end plate.
FEATURES
- Reduced-length 5-position Receiver Extension Constructed of 7075 Aluminum
- Includes a Short Heavy Buffer (3.5 oz), Extra Power Spring, Castle Nut and QD End Plate.
