Phase 5 Weapon Systems Rifle Mini Stock Assembly — Black Anodized Aluminum — Fits AR-15 / AR-10 (Model: RMSA)
Model: RMSA — UPC: 813318023292
Upgrade the ergonomics, balance, and modularity of your AR platform with the Phase 5 Weapon Systems Rifle Mini Stock Assembly. Built from precision-machined aluminum and finished in a durable black anodize, this compact, lightweight stock assembly delivers professional-grade performance for shooters who want a low-profile, rugged, and highly adaptable buttstock for both AR-15 and AR-10 platforms. Whether you’re building a lightweight patrol rig, a compact carbine, or a competition-ready rifle, the RMSA provides the fit, strength, and features you need to shoot better and carry easier.
Engineered for Performance & Durability
The Phase 5 RMSA is CNC-machined from high-strength aluminum for an ideal strength-to-weight ratio. Its hard-coat anodized finish protects against corrosion, wear, and the elements while keeping reflections to a minimum. The design eliminates unnecessary bulk while preserving a secure cheek weld and positive shoulder contact for fast, repeatable aiming. Built with tactical use in mind, the RMSA stands up to heavy use in range, duty, and field conditions.
Key Features
Model: RMSA (Rifle Mini Stock Assembly)
UPC: 813318023292
Material: 6061-T6 aircraft-grade aluminum (major components) with polymer or rubberized buttpad as specified
Finish: Black hard-coat anodized (durable, low-glare)
Compatibility: Designed to work with mil-spec AR-15 and AR-10 receivers/car buffer tube systems (verify buffer tube type before purchase)
Length of Pull: Shortened / compact profile for tighter platforms and improved maneuverability
Weight: Lightweight design to reduce overall rifle mass and improve handling
Attachment Points: Multiple sling mounting options (QDM/QD sockets or sling loops depending on configuration)
Adjustability: May include limited length-of-pull adjustment or modular mounting hardware depending on variant
Construction: Reinforced mounting geometry to resist flex and maintain zero/point-of-aim consistency
Benefits & Why It’s a Smart Upgrade
Compact & Maneuverable: The mini profile shortens overall rifle length and improves handling in close quarters without sacrificing control—ideal for carbine builds and patrol rifles.
Robust & Reliable: Aluminum construction and hard-coat anodize deliver rock-solid durability that resists deformation and environmental wear.
Comfortable Shooting: Designed cheek surface and ergonomic buttpad provide a consistent cheek weld and reduced felt recoil for faster follow-up shots.
Modular Mounting: Multiple sling attachment points let you set up one-point or two-point slings, and many installs are compatible with common QD mounts for quick changes.
Aesthetically Clean: Low-profile, tactical styling complements modern rifle builds and pairs well with M-LOK, KeyMod, or free-float rails.
Universal Appeal: Works on both AR-15 and AR-10 platforms (confirm tube spec and buffer system compatibility before ordering).
Compatibility & Fitment Notes
The RMSA is engineered to interface with standard mil-spec and many commercial buffer tube systems, but AR-10 variations and proprietary receivers can differ. Before purchasing, verify:
Your buffer tube outer diameter/type (mil-spec vs commercial).
That your upper/lower receiver geometry does not require additional adapters.
That the chosen RMSA configuration matches any polymer/rubber buttpad or QD sling socket preferences you require.
If you’re unsure, check your rifle’s specifications or consult your armorer to confirm fitment—Phase 5 designs favor modular adaptability but precise fitment ensures optimal performance.
Installation Overview
Installation is designed to be straightforward for anyone familiar with AR platform basics:
Ensure the rifle is unloaded and safe.
Remove the existing stock per manufacturer procedures.
Slide the RMSA onto the buffer tube (or secure to the stock mounting interface) aligning mounting surfaces.
Tighten mounting hardware to specified torque values supplied with the stock (use threadlocker where recommended).
Confirm cheek weld, length of pull, and sling attachment points; test function with an empty chamber before live fire.
Avoid over-torquing fasteners and follow supplied instructions. If in doubt, have a qualified gunsmith perform the installation.
Ideal For
Tactical and duty rifles where compactness and durability matter.
Short-barreled or SBR builds requiring a shorter LOP.
Competition shooters seeking a lightweight, repeatable cheek weld.
Hunters and operators who need a rugged stock that reduces overall weight without sacrificing control.
Builders and armories looking for a professional, OEM-quality component.
Care & Maintenance
Wipe down after use with a lightly oiled cloth to remove sweat and residue.
Inspect mounting screws and sling attachments periodically for tightness—re-torque per manufacturer recommendations.
Keep anodized surfaces free of abrasive cleaners; mild soap and water or a soft brush are sufficient for cleaning.
Replace rubberized buttpads if worn for continued comfort and recoil control.
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Final Thoughts
The Phase 5 Weapon Systems Rifle Mini Stock Assembly (RMSA) is a high-value upgrade for any AR builder who wants the combined benefits of sturdiness, compactness, and refined ergonomics. Its precision-machined aluminum construction, low-profile design, and multiple sling options make it a versatile choice across law-enforcement, competition, hunting, and tactical applications. When you need a stock that trims bulk without trimming performance, the RMSA delivers professional features in a lightweight package built to last.
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