CMC Triggers AR-15 Mil-Spec Carbine Buffer 3.0oz Black - CMC-AR15-BUF-STD

CMC Triggers AR 15 Standard Carbine Recoil Buffer 3 0oz Aluminum Black CMC AR15 BUF STD UPC 810169562390

Product Description

The CMC Triggers® AR-15 Carbine Buffer (SKU: CMC-AR15-BUF-STD / UPC: 810169562390) is an armorer-grade replacement and build component engineered to establish baseline cyclic timing and reliable bolt carrier travel in standard AR-15 platforms. Manufactured to strict Mil-Spec external tolerances, this 3.0-ounce carbine buffer serves as the foundational recoil component for direct-impingement carbines firing factory-loaded 5.56 NATO, .223 Remington, and 300 Blackout ammunition.

Precision-machined from lightweight, high-strength aluminum, the buffer casing is finished with a durable black anodized surface treatment that resists galling, internal receiver wear, and bore solvent degradation. Housed inside the body are sliding steel counterweights separated by synthetic shock-absorbing pads that deaden cyclic bounce during bolt closure, preventing out-of-battery malfunctions and ensuring uniform chamber lockup under rapid semi-automatic fire.

The rear of the buffer features a high-density, impact-resistant polyurethane bumper pinned securely to the casing to dampen kinetic energy at the rearward end of the buffer stroke. Whether replacing a fatigued factory buffer or assembling a new Mil-Spec carbine lower receiver from the ground up, the CMC-AR15-BUF-STD delivers the consistent weight, smooth reciprocating action, and rugged dependability required for reliable operation.

*Armorer Bench Notes & Real-World Staging Guidance:*

Fitment Matrix: Fits standard AR-15 / M4 carbine-length receiver extensions (7-inch internal depth). CRITICAL: NOT compatible with AR-10 or DPMS LR-308 carbine receiver extensions; attempting to run this 3.25-inch buffer in a .308 carbine system will prevent the bolt carrier from traveling far enough rearward to cycle rounds or engage the bolt catch. NOT directly compatible with fixed rifle-length (A1/A2) buffer tubes unless a 2.5-inch spacer is installed. Inspect the polyurethane bumper periodically for heavy indentation or cracking after high round counts.

1. Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty.
2. Depress the rear takedown pin, pivot the upper receiver open, and depress the buffer retainer pin to remove the existing buffer and carbine spring.
3. Inspect the interior of the buffer tube for carbon fouling, metal shavings, or burrs, applying a light coat of CLP or dry-film lubricant if needed.
4. Slide the carbine action spring over the body of the CMC Triggers 3.0 oz buffer until the spring seats firmly against the front shoulder collar.
5. Depress the buffer retainer pin and slide the buffer and spring assembly into the receiver extension until captured behind the retainer, then close the receivers and manually verify bolt lockback on an empty magazine.

Key Features

• Mil-Spec Standard 3.0 oz Mass: Calibrated specifically to balance cyclic timing and reliable extraction across factory carbine and mid-length gas systems.
• Anti-Bounce Internal Counterweights: Sliding steel internal weights eliminate bolt bounce upon chambering, mitigating out-of-battery issues.
• Durable Anodized Aluminum Casing: Low-friction, wear-resistant black finish prevents galling along the inner walls of the receiver extension.
• Impact-Absorbing Polyurethane Bumper: High-durometer pinned polymer bumper absorbs rearward kinetic impact against the tube heel.
• Universal Carbine Compatibility: Direct drop-in fit for both Mil-Spec (1.148") and Commercial-Spec (1.168") AR-15 carbine buffer tubes.

Product Specifications

• Brand: CMC Triggers®
• Model/Series: AR-15 Carbine Buffer (Standard)
• MPN / SKU: CMC-AR15-BUF-STD / CMCAR15BUFSTD
• UPC: 810169562390
• Calibrated Mass: 3.0 oz (Carbine Standard)
• Casing Material: CNC-Machined Aluminum
• Internal Weights: Steel Counterweights w/ Dampener Spacers
• Bumper Material: High-Density Polyurethane
• Finish: Hardcoat Anodized (Matte Black)
• Platform Compatibility: AR-15 / M4 Carbine Receiver Extensions
• Country of Origin: USA