Mountain Billy Gun Lab Goat-15 Helium Features The Mountain Billy Gun Lab Goat-15 Helium is an AR-style semi-automatic rimfire rifle built around a 16 chrome moly vanadium barrel with a black finish and 1/2x28 threads chambered in .22 LR and designed to push the weight boundaries of the AR rimfire category to an extraordinary 2.14 lbs by pairing a lightweight polymer receiver with a chrome moly vanadium barrel. The polymer receiver carries a Picatinny top rail for red dots or magnified optics and the M-LOK handguard provides accessory attachment positions for lights lasers and sling hardware along the forend. For suppressor enthusiasts who want the lightest possible .22 LR AR host youth and new shooters building AR familiarity without fatigue and weight-conscious rimfire users the Goat-15 Helium defines its own category. The seven-position adjustable polymer buttstock accommodates shooters of all sizes and allows length of pull to be dialed in precisely for any shooting position and overall length adjusts between 27.75 and 30.75 for flexibility in field or bench use. A black polymer A2-style grip and tamper-resistant safety keep the control interface straightforward and intuitive for any AR-experienced user and the 1:16 right-hand twist barrel stabilizes standard .22 LR projectile weights reliably for consistent accuracy at rimfire ranges. The 10-round capacity suits the platform for range use and jurisdictions with magazine capacity limits. For suppressors hosts youth rimfire shooters and anyone seeking the lightest AR-style .22 LR available the Mountain Billy Gun Lab Goat-15 Helium is available for sale at GrabAGun. Mountain Billy Gun Lab Goat-15 Helium Specifications Manufacturer: Mountain Billy Gun Lab Model: Goat-15 Helium Category: Rimfire Rifles Series: Helium Caliber: 22 LR Gun Platform: AR Style Stock Finish Group: Black Capacity: 10+1 Stock Material: Polymer Action: Semi Auto OAL: 27.75 -30.75 Hand: Right Hand Sights: None Barrel Finish: Black Barrel Material: Chrome Moly Vanadium Twist: 1:16 RH Receiver Description: Picatinny Rail Grips: Black Polymer Handguards: M-LOK Receiver Material: Polymer Safety: Tamper Resistant Thread Pattern: 1 / 2x28 Stock Description: Adj 7 Position Buttstock Barrel Description: Threaded Barrel Length: 16 Receiver Finish: Black Weight: 2.14 lbs Stock Finish: Black Available At: GrabAGun