I know this magazine was designed for the Swarm Magnum 10x Gen2 but it works great on my Swarm Fushion 10x Gen2 in 22 caliber. I also tried it on my .177 but it will not rotate for the next pellet on every shot but it is flawless on my 22 caliber. No more double feeds possible when shooting my 22 caliber. You may want to try it.