FN FN-15 Rifle Buffer Tube Kit

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FN FN-15 Rifle Buffer Tube Kit

Upgrade your AR-15 build with the FN FN-15 Rifle Buffer Tube Kit—engineered for reliability and precision. Designed to meet the demands of tactical shooters and home builders, this kit ensures consistent cycling and a solid lockup. We ship to all US states, fast and discreet.

Key Specifications

• Material: Mil-spec 7075 aluminum buffer tube
• Finish: Type III hardcoat anodized
• Compatibility: Standard carbine-length buffer systems
• Includes: Buffer tube, castle nut, end plate
• Weight: 4.2 oz (tube only)

Feature Breakdown

The FN FN-15 buffer tube is machined from 7075 aluminum, the same grade used in military applications. Its Type III anodizing resists wear from sling mounts, stocks, and harsh environments. The internal dimensions are precision-milled to ensure smooth operation with carbine buffers and springs.

This kit includes a properly staked castle nut and end plate, critical for maintaining tension under recoil. The nut’s serrations provide a firm grip for tools during installation, while the end plate’s QD swivel socket offers sling-mount versatility. Both components are heat-treated for durability.

Unlike commercial-grade tubes, this mil-spec design guarantees compatibility with aftermarket stocks and receiver extensions. The tube’s threading follows SAE specifications, eliminating fitment issues with common lower receivers. Its lightweight profile balances maneuverability without sacrificing strength.

Designed for builders who prioritize function over flash, the FN-15 kit skips unnecessary branding. The matte black finish blends with most builds, and the tube’s internal bore is deburred to prevent spring binding. Ideal for duty, competition, or frequent range use.

Compatibility

Fits most AR-15/M4 platforms with carbine-length receiver extensions. Compatible with:

• Mil-spec carbine buffers and springs
• Collapsible stocks (CAR-15, MOE, CTR, etc.)
• Standard lower receivers with threaded buffer ports

Installation Overview

Installation requires an armorer’s wrench, vise block, and torque wrench (35–40 ft-lbs recommended). Thread the tube into the lower receiver until flush, then secure with the castle nut. Stake the nut into the end plate’s notch for added security. Test function before live fire.

FAQ

Q: Does this work with rifle-length buffer systems?
A: No, this kit is designed for carbine-length setups only.

Q: Is staking the castle nut necessary?
A: Highly recommended to prevent loosening under recoil.

Q: Will aftermarket stocks fit this tube?
A: Yes, if they’re mil-spec compatible (most commercial stocks require adapters).

Q: What’s the difference between 6061 and 7075 aluminum?
A: 7075 is 30% stronger and more resistant to impact deformation.

Q: Can I use this on a pistol build?
A: Check local laws—buffer tubes themselves are not caliber- or platform-specific.

Warranty & Shipping

All parts are covered by a lifetime warranty against manufacturing defects. Ships in unbranded packaging via USPS or UPS. Contact us for replacement requests—no proof of purchase required for genuine FN components.

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