Product Description
The B5 Systems Sierra K Receiver Extension Kit is the proprietary mounting system designed for the Sierra K Buttstock. Built from mil-spec materials and finishes, this reduced-length kit is engineered for compact builds while maintaining durability and reliable function. It includes a 5-position receiver extension made from 7075 aluminum, along with the key buffer system and mounting components needed for installation. Proudly made in the USA.
Product Highlights
- Proprietary Sierra K mounting solution featuring a reduced-length, mil-spec diameter receiver extension
- 7075 aluminum, 5-position receiver extension for strength and adjustable fit
- Includes short heavy buffer (3.5 oz) and extra power spring for dependable cycling
- Comes complete with castle nut and quick-disconnect (QD) end plate for secure mounting and sling compatibility
- Mil-spec materials and finishes; Made in the USA
Specs
- Brand: B5 Systems
- Product Type: Receiver Extension Kit (Sierra K)
- Manufacturer Part Number: SRK-1660
- UPC: 814927024793
- Color: Black
- Receiver Extension: Reduced-length, mil-spec diameter, 5-position
- Receiver Extension Material: 7075 Aluminum
- Included Components: Receiver extension, short heavy buffer, extra power spring, castle nut, QD end plate
- Buffer Weight: 3.5 oz
- Country of Manufacture: Made in the USA
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