This is is the orginal airsoft mossberg m500 replica - $240 (i think tanaka made one too) all the clones were based on this bad boy right here. Black heavy metal externals in a cruiser/pistol grip configuration with an HPA resovier in the rare 8mm format. THE DETAILS These came in two flavors....6mm and 8mm. Good luck finding either variation these day these have been discontiuned for a while but even as long as i've been a shotgun enthusiest i've only seen the 8mm verision a handful of times (5<) . The normal gun has a gas resovier for your choice of propellent. well guess what it's HPA tapped for your FPS preferences, consistnecy, and stamina. Also its gonna hurl 8mm meteors, if you're missing with this...we got a problem an it aint the gun. I got it on this reddit as a boneyard. It was leaky and would lock the pump after charging. After some techning she's air tight, and consistnet. I'll also be including 2 bags of 8MM meteors...i mean bbs.