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.
Specifications
| 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. |
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