What.s in the Box Blue Line Mauser M-15 22LR Carbine (1) 22-Round Magazine Owner's Manual The Blue Line Solutions/Mauser M-15 22LR rimfire carbine features a 3-position synthetic, side folding stock, and folding front/rear sights. Each rifle ships with one 22 round magazine. Firearm Specifications Manufacturer: Blue Line Solutions / Mauser Model: M-15 Caliber: 22LR Barrel Length: 16.53" Overall Length: 34.65" / 36.06" (Max) Weight: 6.45 lbs. Receiver Finish: Blued Stock: Black Side Folding / 3-Position Synthetic