yep, they're small pin uppers, fit any mil-spec lower. I like the way they look and have a Colt SP1 that I bought new maybe 30 yrs ago.
I like the newer A2s even better, although I carried an M-16 for most of the 30yrs I was in the Army through 2 wars and a skirmish (grenada) and never needed the forward assist, I still like having it there... and the brass deflector is a good tweak, it's just a pain in the butt to clean the brass marks off of it after a day at the range. Sweets and a nylon brush works pretty good though.
The ones that CDNN are selling are in "good" overall condition. You can pretty much buy a new A2 for what they're selling for.
These are, in fact, Colt M16A1 uppers and not SP1 uppers. The two I have seen appeared to be "like new", showing only a few scratches and a little wear on the bolt carrier raceways. They will fit on any lower with a standard .250 front push pin. I think CDNN is now bundling them with a free A1 stock set (stock, buffer tube, buffer, spring, etc) for $399.
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