The Mountain Billy Gun Lab GOAT-15 Helium .22 LR Rifle (brand part no. MBGL-GOAT15-TB-1-HC) is a scaled-down AR-style rimfire built 20% more compact than a standard AR-15, giving new shooters and plinkers a lightweight platform that still runs like a full-size rifle. Mountain Billy Gun Lab builds the GOAT-15 Helium around a 16-inch CMV steel barrel with a 1:16 twist and a 1/2×28 threaded muzzle, mounted in a black polymer receiver with a Picatinny top rail and M-LOK handguard. At just 2 pounds 14 ounces unloaded, it’s dramatically lighter than a standard-size AR-15, making it easy to handle for younger or smaller-framed shooters without sacrificing familiar AR controls. Among our AR rifles, the GOAT-15 Helium suits first-time rifle shooters, youth hunters, and anyone who wants an inexpensive-to-shoot .22 LR trainer that handles like their centerfire AR.

Key Specifications

• The chambering is .22 Long Rifle.
• The barrel is 16 inches long, made of CMV steel.
• The rate of twist is 1:16 inches.
• The muzzle is threaded 1/2×28.
• The magazine capacity is 10+1 rounds.
• The receiver is black polymer with a Picatinny top rail.
• The handguard is an M-LOK handguard.
• The stock is a 7-position adjustable polymer buttstock.
• The unloaded weight is about 2 pounds 14 ounces, roughly 20% lighter than a standard AR-15.
• The safety is tamper-resistant for younger or first-time shooters.

Frequently Asked Questions

Is this rifle sized for smaller shooters? Yes, it’s built 20% more compact than a standard AR-15 and weighs under 3 pounds unloaded, making it easier for youth and smaller-framed shooters to handle.

Does the barrel accept a suppressor? Yes, the muzzle is threaded 1/2×28 for a compatible suppressor or muzzle device.

How many rounds does the magazine hold? It ships with a 10-round magazine for 10+1 capacity.

Buy the Mountain Billy Gun Lab GOAT-15 Helium .22 LR Rifle

A genuinely lightweight AR-pattern .22 LR built for new shooters and dedicated plinkers alike, the GOAT-15 Helium delivers familiar AR ergonomics in a rifle nearly anyone can handle comfortably. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.