The M401 Pump action Spring powered air soft shotgun was a surprise to me. I figured for thirty bucks, what the heck, I'll bite. I'm glad I did, Yeah the gun is mostly made of Polymer plastic, minus the barrel, Main spring, Pivot Pin. Its got a Decent feel to the Trigger, and shot an average of a whopping 385 FPS!! on the Chronograph. I'm assuming it has a decent compression chamber. There is no cocking lever, or BB follower.