Product Description
The CMMG MK4 Receiver Extension Castle Nut is a replacement castle nut designed to secure your receiver extension (buffer tube) for AR-15 platforms. Manufactured for dependable fit and function, it features a durable matte black finish for a clean, corrosion-resistant look that complements most builds. Ideal for maintenance, repairs, or upgrades, this castle nut helps keep your buffer tube assembly properly retained under hard use.
Product Highlights
- AR-15 castle nut for securing the receiver extension (buffer tube)
- Matte black finish for a low-glare, tactical appearance
- Quality replacement component from CMMG for reliable fit and function
- Durable steel construction for long service life
- Great for repairs, rebuilds, and AR lower receiver upgrades
Specs
- Brand: CMMG
- Product Type: Receiver extension (buffer tube) castle nut
- Platform Compatibility: AR-15
- Model/Series: MK4
- Finish/Color: Matte Black
- Material: Steel
- Weight: 0.1 lb
- Country of Manufacture: United States of America
- Manufacturer Part Number: 55CA9CB
- UPC: 815835017426
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