Phase 5 Weapon Systems RMSA Rifle Mini Stock Assembly Black Aluminum for AR15/AR10

The Phase 5 Weapon Systems RMSA Rifle Mini Stock Assembly is a compact, fixed stock solution for AR15 and AR10 platform rifles. Built from black aluminum, this stock trades the adjustability of tube-style designs for a smaller profile that works well in tight spaces, vehicle storage, or when you're prioritizing a shorter overall length. It's a straightforward, durable choice for shooters who want a lightweight rear assembly without the complexity of adjustable mechanisms.

Designed to fit both .223 and larger-caliber AR builds, the RMSA slots into your existing receiver extension without additional modifications. The aluminum construction keeps weight minimal while standing up to the demands of field use, whether you're training at the range, hunting, or running practical drills. Black anodize finish resists corrosion and blends seamlessly with modern AR platforms.

Phase 5 Weapon Systems focuses on no-nonsense AR accessories that deliver function over bells and whistles. This stock reflects that philosophy—a reliable, compact rear component that simply works, backed by a company known for solid engineering in the AR community.

Key Features

• Compact fixed design reduces overall rifle length
• Black aluminum construction for lightweight durability
• Compatible with both AR15 and AR10 platforms
• Anodized finish resists corrosion
• No-adjustment simplicity and reliability

Frequently Asked Questions

Will this stock fit my AR15 and AR10?

Yes. The Phase 5 RMSA is designed to work with both AR15 and AR10 rifles. Verify your buffer tube compatibility before purchase.

Is this a fixed or adjustable stock?

The RMSA is a fixed stock assembly. It does not adjust for length of pull, keeping the design simple and compact.

What finish does it have?

The stock features a black anodized aluminum finish that resists corrosion and weathering.

What is the primary advantage of a mini stock design?

A mini stock reduces overall rifle length, making it easier to handle in vehicles, tight spaces, or when storage footprint matters. It also works well for shooters who don't need adjustable length of pull.