Mountain Billy Gun Lab Stock Assembly

Upgrade your GOAT-15 or AR-style build with the Mountain Billy Gun Lab Stock Assembly. It's engineered for comfort, durability, and better control on every shot. Designed specifically for .22LR platform firearm builds and lightweight rifles, this stock assembly offers a secure shoulder placement, improved recoil management, and a dialed-in fit that enhances accuracy and confidence for both new shooters and experienced firearms enthusiasts.

Made to pair seamlessly with the GOAT-15 platform, this stock assembly provides the perfect balance of lightweight handling and solid performance. Whether you're building out a precision plinking rifle, a trainer setup, or a backyard steel competition gun, this stock assembly ensures your firearm feels natural, stable, and ready for action.

Perfect for Training, Competition, and Recreation

The Mountain Billy Gun Lab Stock Assembly is a top choice for:

• New shooters learning firearm fundamentals

• Competition shooters dialing in their lightweight .22LR

• Training new shooters on safe handling

• Builders customizing their GOAT-15 rifle or pistol platforms

• Anyone looking to improve firearm comfort, stability, and control

Whether you’re at the range, plinking steel with friends, or perfecting defensive gun handling skills on a lightweight platform, this stock assembly enhances the experience and supports better shooting technique.

Own the Range | Build it the GOAT Way.

Customize your setup with high-performance parts designed for the world's lightest semi-automatic firearms platform. Pair this stock assembly with Mountain Billy Gun Lab magazines, upgrade kits, and accessories for a full GOAT-15 build experience.

*Firearm Control Legislation restricts the sale of the GOAT-15 Stock Assembly in the following jurisdictions: Illinois. Last updated 15-08-25. Due to changing law this list may change without notice. If the end use is determined to be a restricted and unlawful purchase, it will be cancelled and refunded.