I picked up an A3 Bushmaster 20" H-Bar upper with all the usual stuff (charging handle, bolt, carrier, carry handle) on "the cheap" last week. It had been a new complete rifle, but had been parted out at the local class3 dealer, to build up a carbine for county PD.
Haven't had a 20" upper in several years and thought @ $400 for a new Busmaster upper...what the hell.
I've had a box of AR parts kicking around for some time now, and was figuring on using the lower that I've had for many years. That way I'd have my carbine upper and a rifle upper to play with too.
Well, long story short, at the dealer I also ended up buying a Bushmaster lower parts kit ($65), and a Stag Arms stripped lower($115). Pretty impressed with the Stag Arms lower. The overall quality is really pretty good. There are a few edges that may be a little sharp compared to my old Bushmaster, but it runs great (as does my old Bushmaster lower with the 20" upper).
So let's see, that's 580 bucks, a box of old parts, a couple of cans of PBR and an hour and a half of labor, and.....poof.... Two nice ARs insted of one.