I was looking at one of the Bushmaster AR pistols the other day (pic below). I really find one of these novelty guns appealing but the thing is just way to much plastic for my liking. That made me start to wonder if a person could build one of their own that was a little more to their liking and a little less plastic. I am kind of just looking for a reason to buy and use the lower I have pictured below. Does anyone have any info on whether all the parts needed would be available? About how much could a person expect to spend?