MP-40 Carbine Features This is the closest you can get to an original MP-40 while keeping a rimfire action. This model comes with an underfolding stock (like a real MP-40) and a faux suppressor. MP-40 Carbine Specifications Brand: Mauser Rimfire Category: Rimfire Rifles Caliber: 22 LR Model: MP-40 Carbine Stock Finish: Black Action: Semi-Auto Barrel Length Range: 16 to 16.99 Sights: Adjustable Rear Capacity: 10+1 Muzzle: Faux Suppressor Receiver Finish: Black Stock Description: Underfolding Stock Finish Group: Black Twist: 1:16 Barrel Finish: Black Barrel Length: 16.30