Phase 5 CMSA Carbine Mini Stock Assembly

Phase 5 Carbine Mini Stock Assembly: Compact Performance Meets Precision Engineering

The Phase 5 Carbine Mini Stock Assembly (CMSA) represents a thoughtful solution for shooters seeking a more compact stock platform without sacrificing durability or functionality. This combo kit pairs Phase 5's Universal Mini Stock (UMS) with their HexOne buffer tube—a purpose-built combination designed to work seamlessly together.

What Sets It Apart

The UMS features a distinctly smaller footprint and curved bottom profile that anchors solidly against your chest. This geometry allows shooters to transition between positions more fluidly and achieve better control during rapid shooting sequences. The design philosophy here is straightforward: a stock should work with your body, not against it.

Construction and Materials

• HexOne Buffer Tube: Machined from 7075-T7 aluminum with a hexagonal cross-section that's substantially thicker and more robust than standard mil-spec receiver extensions
• Universal Mini Stock: Precision-machined from 6061-T6 aluminum, manufactured in-house from USA-sourced billet stock
• Both components are produced with tight tolerances and attention to detail

Versatility Across Calibers

The HexOne tube's reinforced design makes it suitable for a wide range of applications: 5.56 NATO, 300 Blackout, 7.62x39, and .308 Winchester. It also accommodates pistol caliber carbines in 9mm, .40 S&W, and .45 ACP, though you may need to adjust your buffer and spring configuration for optimal reliability.

Compatibility

While designed to work with the included HexOne tube, the UMS is also compatible with mil-spec carbine receiver extensions and most round buffer tubes, giving you flexibility if your platform requires it.

This is a stock system built for shooters who understand that sometimes smaller is better—when it's engineered correctly.