Its a Stoner 63 inspired piston operated weapon. Contrary to popular belief, not every piston operated weapon is an AK variant. The bolt looks similar to that of a G36 and operates in a similar manner. I really like them. They are accurate, reliable and recoil is negligible, even for a 5.56 weapon. The weapon can be changed from rifle to carbine very quickly and ith as an adjustible gas regulator. I think its a great looking weapon, though I am fond of the Stoner 63 and this is as close as any of us will ever come. Development was cut seriously short as they had big plans for this weapon. Alternate calibers and a belt fed version were supposed to follow, but never quite made it. I think Robarm lacked the resources to fully develop the weapon and prices were already way to high to be competitive, so they gave up and left it as is. Had the M96 been fully developed, I think it would have been much more competitive. Several gun rags called it the best .223 autoloader availible....Early models have some issues with the bolt, amongst other things but later versions have been reliable weapons. The Bren configuration is ludicris and a poor substitute for a belt fed conversion. Had they done this right, the XCR would not exist....well, it really doesn't because they cant seem to get this right eiether and they probably will never make it to the market. I personally really like this weapon. I haven't heard a bad thing from friends that own them and they are every bit as accurate as an AR variant. If my gun shop of choice ever gets a used one, I will buy it in a second. I nearly bought one years ago with some cash I fell into, but I decided to take that money and buy 2 AR's and some ammo. You would see many more of them if they weren't 1700.00....Its on the way out, especially if the XCR ever comes online. With piston AR's and Sig/FN weapons, its going to be discontinued. To much money, obscure design, poor support and outclassed by the competition....that being said, I like them and look forward to owning one.