AR-15 Rifle Buffer — Mil-Spec Weight & Length for Fixed-Stock Systems | UPC 859819007164

Build your rifle-length AR right from the core. The AR-15 Rifle Buffer (UPC 859819007164) delivers dependable cycling, smooth recoil impulse, and long service life in fixed-stock and rifle-length receiver extension setups. Precision made to mil-spec dimensions, this buffer pairs with a rifle buffer spring and rifle receiver extension (A1/A2 or rifle-length tube) to keep your bolt carrier moving reliably with 5.56/.223 and other AR-15 cartridges tuned for rifle gas.

Why This AR-15 Rifle Buffer

• Mil-spec geometry & mass: Correct internal weight stack and overall length support consistent bolt velocity, reliable feeding, and positive lock-back on quality mags.

• Smooth recoil impulse: The buffer’s weight distribution and durable bumper help reduce felt recoil and muzzle dip, improving shot-to-shot recovery.

• Durable construction: Hardened components and a robust polymer bumper resist peening under high round counts and training cycles.

• Drop-in compatibility: Fits AR-15 rifle-length receiver extensions (fixed stocks) with a rifle buffer spring—ideal for A1/A2 stocks and precision rifle builds.

• Versatile performance: Proven with standard 5.56/.223 as well as popular AR-15 chamberings tuned for rifle gas systems (e.g., .224 Valkyrie, .350 Legend, etc.).

Note: This is a rifle-length buffer. It is not for carbine receiver extensions. Use the correct tube and rifle buffer spring.

Ideal For

• Fixed-stock rifles (A1/A2) and precision AR-15 builds

• Rifle-length gas systems seeking maximum reliability and soft recoil

• Bench, varmint, and match rifles where consistency equals accuracy

• Duty/training rifles that need dependable lock-back and repeatable timing

Key Features at a Glance

• Platform: AR-15 (rifle-length buffer system)

• Use: For rifle receiver extension (A1/A2/rifle-length tube)

• Function: Controls bolt carrier movement; aids feed, extract, eject, lock-back

• Construction: Mil-spec materials with polymer bumper and internal weight stack

• Finish: Wear- and corrosion-resistant exterior

• UPC: 859819007164

Compatibility & Setup

• Works with:

  • Rifle receiver extension (fixed stock)

  • Rifle-length buffer spring (not carbine)

  • Standard AR-15 BCG (5.56 carrier), matched to your caliber/chamber

• Do not mix: Carbine springs/buffers with rifle-length tubes (and vice versa).

• Gas system: Optimized for rifle gas on 18–20"+ barrels; can work in tuned intermediate setups where rifle-length timing is specified.

Installation Tips (Quick Reference)

1. Verify clear & safe. Separate upper and lower.

2. Install spring & buffer: Insert the rifle buffer spring into the rifle extension, then follow with the rifle buffer (bumper facing outward).

3. Retainer check: Ensure the buffer retainer captures the buffer correctly while allowing smooth movement.

4. Function test: Cycle the action. Confirm smooth travel, positive lock-back on an empty mag, and proper bolt release.

Pro Tip: Pair this buffer with a quality rifle spring and a properly sized gas port (or adjustable gas block) to fine-tune recoil and ejection for your load and suppressor use.

Troubleshooting & Tuning

• No lock-back: Verify magazine and gas, then spring condition; confirm you’re using a rifle-length buffer and spring in a rifle tube.

• Violent ejection or bolt speed: Consider gas adjustment or heavier buffer options (where appropriate) while maintaining the rifle-length standard.

• Short-stroking: Check gas block alignment, gas port size, ammo, and spring fatigue.

Maintenance

• Wipe carbon and debris from the buffer face and polymer bumper during routine cleanings.

• Keep a light film of oil in the receiver extension—avoid heavy grease that traps grit.

• Inspect the buffer roll pin and bumper for wear; replace components at signs of damage.

Specifications

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Get the timing right and the recoil smooth—drop in this AR-15 Rifle Buffer for dependable cycling in your fixed-stock, rifle-length build.
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