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Mfg Item #: SRK1660
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.
| Ar15 Accessory | Y |
|---|---|
| Other Features | SRK EXTENSION KIT COMES WITH RECEIVER EXTENSION, BUFFER AND SPRING |