Product Description
The TacFire MAR039 castle nut is a steel, black-finished locking nut designed for AR-15 carbine buffer tube assemblies. It is used to secure and tighten the receiver extension (buffer tube) to the lower receiver, helping maintain a stable and reliable stock/buffer tube setup. Built for straightforward installation, it’s a practical replacement or build component for .223/5.56 AR-15 platforms.
Product Highlights
- Steel construction with a black finish for durable AR-15 buffer tube assembly use
- Castle locking nut design helps securely retain the receiver extension (buffer tube) to the receiver
- Compatible with .223/5.56 AR-15 carbine stock/buffer tube setups
- Designed to meet Mil-Spec fit standards for dependable integration
- Compact, lightweight component ideal for new builds or replacement parts
Specs
- Brand: TacFire
- Manufacturer Part Number: MAR039
- UPC: 811261021914
- Product Type: AR-15 castle nut / buffer tube locking nut
- Material: Steel
- Color: Black
- Overall Length: 1.375 in
- Net Weight: 0.5 oz
- Compatibility (as listed): AR-15 .223/5.56 carbine buffer tubes; fits commercial and Mil-Spec buffer tubes
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