Phase 5 Weapon Systems — Carbine Mini Stock Assembly (CMSA) — Black Aluminum for AR-15 / AR-10 — UPC 813318022738

Meta (SEO) short description: Compact, billet-machined Carbine Mini Stock Assembly (CMSA) from Phase 5 Weapon Systems — black anodized aluminum fixed mini stock with HexOne buffer tube and Universal Mini Stock (UMS). Built from 7075-T7 & 6061-T6 billet for lightweight strength and a sleek, low-profile carbine stance. UPC 813318022738. Phase5 WSI+1

Product Snapshot

The Phase 5 CMSA (Carbine Mini Stock Assembly) is a ready-to-install fixed stock kit that pairs the HexOne buffer tube with Phase 5’s Universal Mini Stock (UMS) to deliver a compact, rugged stock solution for AR-platform rifles. Machined from USA-sourced billet aluminum, the CMSA gives rifles a comfortable, tucked-in carbine feel while adding strength, a clean aesthetic, and long-term durability. Ideal for shooters who want the shorter profile of an SBR-style setup without permanent modifications. Phase5 WSI+1

Key Features & Benefits

• Precision billet construction: HexOne buffer tube is CNC-cut from 7075-T7 aluminum and the UMS is CNC-machined from 6061-T6 for an optimal strength-to-weight ratio. OpticsPlanet

• Low-profile carbine stance: Short, minimalist footprint lets you “tuck” the stock close to the shoulder for compact handling and faster transitions. Cheaper Than Dirt

• Fixed, rock-solid mounting: Unlike polymer collapsible stocks, the CMSA provides a stout fixed solution designed to remain rigid shot after shot. Phase5 WSI

• Premium finish: Matte black anodized/tumbled exterior for corrosion resistance and a professional, non-reflective look. Palmetto State Armory

• Compatibility: Engineered for AR-15/AR-10 platforms and works with mil-spec carbine receiver extensions and many round tubes — UMS was designed to complement the HexOne but will fit other common buffer tubes. (For .308/.300 BLK or non-standard calibers, refer to buffer/spring recommendations from Phase 5 or your gunsmith.) JSE Surplus+1

Specifications (Manufacturer / Retailer reported)

• Model / SKU: CMSA (Carbine Mini Stock Assembly). MidwayUSA

• UPC / Barcode: 813318022738. MidwayUSA

• Materials: HexOne buffer tube — 7075-T7 billet aluminum; Universal Mini Stock (UMS) — 6061-T6 billet aluminum. OpticsPlanet

• Finish: Black anodized / tumbled matte. Cheaper Than Dirt

• Type: Fixed mini stock assembly (includes buffer tube, stock, buffer, spring, castle nut, end plate and basic hardware in many retail packages). Confirm included parts with the seller listing. OpticsPlanet+1

Who It’s For

• Tactical and practical shooters who want the handling and balance of a short-length stock without permanently shortening the receiver. Cheaper Than Dirt

• Owners of AR-15 and AR-10 platforms seeking a billet aluminum upgrade that pairs durability with a compact profile. Palmetto State Armory

• Builders who appreciate matched aesthetic and machined precision across components.

Performance & Use Notes

• The CMSA delivers a rugged, repeatable cheek weld and reduced overall length of pull compared with full-length stocks, improving maneuverability in close quarters and when shooting from supported positions. Phase5 WSI+1

• Because the CMSA is a fixed billet assembly, it increases rigidity versus polymer collapsible stocks — expect consistent cheek weld and zero-return characteristics. OpticsPlanet

Compatibility & Fitment Guidance (High-level)

• Designed for standard AR-pattern receivers. The UMS fits common buffer tubes (including mil-spec carbine receiver extensions) and is frequently sold as a direct fit on AR-15 and many AR-10 variants. Always verify your rifle’s buffer/spring requirements and whether a caliber-specific buffer (e.g., .308 carbine buffer) is recommended for your build. Do not rely on this description as a substitute for checking the product listing or consulting a qualified gunsmith. JSE Surplus+1

What’s in the Box (typical retail package)

Retailers commonly list the CMSA package as including: HexOne buffer tube, Universal Mini Stock (UMS), carbine buffer, Phase 5 enhanced buffer spring, castle nut, end plate, and an Allen wrench or small hardware set. Exact contents vary by seller — confirm the included hardware on the product page before purchase. OpticsPlanet+1

Care & Maintenance

• Keep anodized surfaces clean and free of abrasive residues. Wipe with a soft cloth and use a light gun oil on metal-to-metal contact points when assembling or maintaining the rifle. Periodically inspect mounting hardware and torque values as part of routine firearms maintenance. For any signs of unusual wear or fitment issues, consult the manufacturer or a qualified gunsmith. Palmetto State Armory

Why Choose Phase 5’s CMSA

Phase 5 Weapon Systems is known for purpose-driven, billet-machined AR components. The CMSA blends premium materials, compact ergonomics, and a refined aesthetic — offering shooters a durable, low-profile stock solution that looks and performs like a high-end upgrade without unnecessary bulk. Whether refreshing an existing platform or finishing a precision carbine build, the CMSA is a thoughtfully engineered option. Phase5 WSI+1

SEO-Optimized Closing Paragraph

Upgrade your AR-15 or AR-10 with the Phase 5 Weapon Systems Carbine Mini Stock Assembly (CMSA) — a compact, billet-machined fixed stock kit featuring the HexOne 7075-T7 buffer tube and 6061-T6 Universal Mini Stock (UMS). Finished in matte black and carrying UPC 813318022738, the CMSA delivers reduced profile handling, durable aluminum construction, and a tidy, professional look for tactical, competition, or everyday carry builds. Check product listings for included hardware and confirm buffer/spring compatibility with your platform before purchase to ensure optimal fit and function. Phase5 WSI+1

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