The Sierra K Receiver Extension Kit is the proprietary mounting system for the Sierra K Buttstock. All parts are made of mil-spec materials and finishes and proudly Made In The USA.
- 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.
State & Local Restrictions — Order Reviewed Before It Ships
Some firearms, magazines, and accessories are restricted or prohibited in certain states, cities, and counties, and these laws change often. Each order is manually reviewed against the current laws for your shipping address before it ships. If we can't lawfully ship this item to your location, we'll contact you to cancel or adjust your order and issue a refund. You're responsible for knowing and following the laws where you live — if you're unsure, please check or ask us before ordering.
