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B5 Systems
B5 Systems
B5 Systems
B5 Systems
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.
| Series: | Extension Kit |
| No. of Pieces: | 5 |
| Model: | Sierra K |
| Color: | Black |
| Weight: | 3.50 oz |
