This is a very interesting CO2 replica air gun. It is one of the few blow-back pellet guns. There are many blow-back BB replica guns but not many pellet blow-back pistols because the pellets cannot be feed in the traditional vertical stack like BBs or real ammunition. Most pellet pistols use a rotary magazine inserted between the firing tube and the barrel. This prevents blow-back action. This gun supports blow-back action by having a narrow magazine that inserts into the bottom of the grip with an 8-shot rotary in each end. As you pull the trigger, it rotates the rotary and aligns the next pellet. When 8-shots have been made, you reverse the magazine for 8 more. Though it has blow-back, it does not lock the slide on the last shot. You have to count or waste a shot. The downside of this design is that the trigger pull rotates the magazine. As a result, there is quite a stiff break as the magazine is rotated before you get to the single action trigger break. The first break feels a lot like a real semi-automatic trigger break and is distracting. I made a modification to my magazines. I took them apart and snipped a bit of the rotary detent spring off and leveled the spring where it was cut. This reduced the trigger pull needed to rotate the rotary magazine and made the gun much nicer to shoot. I have done this on all my magazines and they are working 100 percent. I also removed the magnet as I will not be shooting BBs in this gun. The pellets are so powerful and accurate, I will never shoot BBs. I suggest that Umarex evaluate the amount of spring tension really need and modify the magazines to work smoother. Otherwise this a a 10/10 gun. I also mounted a Crimson Trace CT1550 red dot optic on the gun with 3M permanent double sided tape - what fun! The stock sights are accurate but I wanted to train with the red dot.
