Hi, I have the M901C Version and to be honest I find it a really good gun, I have it for about 4 months and use it every weekend, I brought this gun knowing nothing about BB guns, ( brought from just bbguns,) it came in the post took about 4 days to come I took it out the box and with a fully loaded mag found it a quite a heavy gun seeing as most of it is plastic. It has a plastic gear box witch works fine I can quite easily shoot a tree from one side of the woods to another about 50m away on semi, auto about 40m. I find it a great gun for £70, but I wouldn't recommend it save up and buy a better g&g or something.