My local gun dealer says he can get a Bushmaster M4gery for $1000, which seems about $250 too high. This is probably a stupid question, but has anyone used a Bushy upper on a Colt MT lower with good results? I'm guessing yes but though I would check first. I also want to get the fake telestock, how much work is it to change it back and forth with the full stock? Wouldn't be changing too often, but I don't want to spend hours changing it around. This way would cost $530, or would I be better off just trying to find a new bushy m4gery for a couple hundred more?