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Mountain Billy Gun Lab

Mountain Billy Gun Lab builds rimfire AR-pattern firearms under its Goat-15 name, and its guns also appear marked Mountain Billy Gun. The Goat-15 Helium is chambered in .22 LR with a 16-inch barrel and a black finish, and the Goat-15 ATOM is a shorter .22 LR configuration with a 7.8-inch barrel.

Featured Mountain Billy Gun Lab Products

Mountain Billy Gun Goat-15 Helium .22 LR 16in Black - .22 LR

Mountain Billy Gun Goat-15 Helium .22 LR 16in Black

Mountain Billy Gun Lab Goat-15 ATOM .22LR 7.8in

Showing 1-2 of 2 Mountain Billy Gun Lab firearms available

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About Mountain Billy Gun Lab

Mountain Billy Gun Lab builds rimfire AR-pattern firearms under its Goat-15 name, and its guns also appear marked Mountain Billy Gun. The Goat-15 Helium is chambered in .22 LR with a 16-inch barrel and a black finish, and the Goat-15 ATOM is a shorter .22 LR configuration with a 7.8-inch barrel.

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Powered by AI and carefully checked for data accuracy by our team and community of gun enthusiasts. Gunsnation.com provides firearm prices, reviews, and vendor listings for informational purposes only. We may earn commissions through affiliate links at no extra cost to you. Prices and product details are subject to change; verify with vendors before purchasing. We do not endorse any products or vendors. Compliance with all applicable laws is your responsibility. Gunsnation.com is not liable for any damages arising from your use of the site.

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© 2026 All rights reserved.

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