Type: BB Machine Gun/Rifle. Manufacturer: Umarex USA. Model: Steel Force (AR Platform). Materials: Plastic and some Metal. Weight: 3.37 pounds (1529 grams). Barrel: Metal non-rifled. Propulsion: CO2 x 2. Action: Semi and 6 round burst blowback, single action only. Ammunition Type: 4.5mm BB's. Ammunition Capacity: 300/30 round hopper/magazine. FPS: 430+. The Umarex Steel Force CO2 BB Machine Gun is for sure an improvement over the Steel Storm, first of all it is a true replica of a real rifle in production (The AR/M16 platform), it also has a rear stock that is adjustable which makes shooting this gun on target so much more easier. Overall I feel it shoots better than the Steel Storm with improved accuracy and performance. With that said the Steel Storm is still a great BB machine gun if your looking for more of a pistol SMG design. For the low cost of the Steel Force you really can not go wrong, this BB machine gun will put a smile on your face every time you take it out to shoot it. Read full article here: https://www.replicaairguns.com/2013/8/16/umarex-steel-force-co2-blowback-bb-rifle-full-review.html Buy the Umarex Steel Force in Canada: http://www.replicaairguns.ca/umarex-steel-force-air-rifle.html Buy the Umarex Steel Force in the US: https://www.replicaairguns.us/umarex-steel-force-air-rifle