If you go with a 20" barrel, you're going to end up with a 12-15 lb rifle. Ive got an AR-10A4 and even with nothing but a scope, mount, and a 5 round mag its still a 12 lb rifle. If I was going to be humping up and down mountains searching for elk, Id carry my Model 7 instead. If you want to build one, go for it!. But, IMO theyre not very practical hunting rifles, due to the excessive weight. I carry mine to a shooting house overlooking a bean field and prop it in the corner.
