Product Description

CMC TRIGGERS AR-15 ENHANCED CARBINE BUFFER TUBE KIT – MIL-SPEC – ENHANCED QD

Now manufactured and assembled in-house in Fort Worth, Texas!

Compatible with Mil-Spec AR-15 stocks, this kit contains all the necessary parts to mount a stock assembly onto your lower receiver.

Six position AR-15 buffer tube is machined from 7075-T6 aluminum with a Type III, Class 2 hard anodized finish. The design features precise drainage holes that remove water from the system in marine environments.

For optimal performance, our enhanced offering includes a carbine recoil buffer body and quick detach receiver end plate are made from 6061 aluminum, a spring made from high-tensile steel, and a castle nut is made from high-carbon steel.

Complete your lower build by adding your favorite CMC Trigger and CMC Lower Parts Kit.

7075-T6 Grade Aluminum
6 Position Mil-Spec Carbine Buffer Tube
Carbine Recoil Buffer 3oz
High-Quality Recoil Spring
Castle Nut & QD Receiver End Plate
Made in the USA

Buffer Tube Lengths & Compatible Buffer Weights

Carbine-Length Buffer Tube (Mil-Spec & Commercial)

Length: ~7"
Inner Depth: ~6.9"
Buffer Weights:
- Carbine Buffer (H0) – ~3.0 oz
- H1 Buffer – ~3.8 oz
- H2 Buffer – ~4.6 oz
- H3 Buffer – ~5.4 oz
- H4 Buffer / Heavier – 6+ oz

A5 Buffer System (VLTOR A5 & Similar)

Length: ~8"
Inner Depth: ~7.9"
Buffer Weights:
- A5H0 – ~3.8 oz
- A5H1 – ~4.56 oz
- A5H2 – ~5.33 oz
- A5H3 – ~6.08 oz
- A5H4 – ~6.83 oz

Rifle-Length Buffer Tube (A2 Fixed Stock)

Length: ~10"
Inner Depth: ~9.75"
Buffer Weights:
- Standard Rifle Buffer – ~5.0 oz
- Heavy Rifle Buffer – ~5.4 oz
- Extra Heavy Rifle Buffer – 6+ oz

Pistol-Length Buffer Tube (PDW / AR Pistol Systems)

Length: Varies (~5.25" – 7")
Inner Depth: Varies
Buffer Weights:
- Standard Pistol Buffer – ~3.0 oz
- Heavy Pistol Buffer (H1-H3 Equivalents) – 3.8–5.5 oz
- Specialized PDW Buffers – 6+ oz

Tuning Notes & Insights from Ally Munitions

We’ve noted that in many cases, heavier buffer weights are well-suited for 6mm ARC and .22 ARC builds, especially when using the CMC and Superlative Arms BCGs we offer.

However, buffer weight selection depends on multiple factors, including:

Suppressor use
Buffer spring type
Ammo selection
Gas port size

Since the buffer system is an interconnected system, determining the right weight for your rifle requires testing different configurations. We strongly recommend purchasing multiple buffer weights and experimenting to see what works best for your setup.