Quoted: You can add the bolt carrier assy from someone else. I haven't seen anyone advertising A-1 uppers. CDNN is selling SP-1's which, of course is the original configuration Colt. Someone here told me these they are selling are indeed brand new. They found a warehouse full of 'em somewhere.
You could build one from parts. You didn't say, but I am assuming you want the look of the original Vietnam-era A-1 with triangle handguards? If you just want an A-1 upper receiver, several folks sell them.
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Well actually, they are NOT SP1 uppers. They are M16A1 uppers---and that's a good thing. If they were SP1s, you would have to use an adapter on the front lug to fit them to a current lower. As milsurp M16A1 pieces, they'll drop right on any current lower.
Why CDNN keeps calling them SP1s is beyond me, but they're not.
Condition? These top parts were pulled off of unissued M16A1s that were being upgraded with M16A2 uppers. They were never issued for service use, but might show a scrtach or two here or there. While I hven't bought one of these uppers, I did buy some of the bolt/carrier assys and cocking pieces that were on them originally, and a couple of the buttstock assys that also were part of CDNNs deal. They werer exactly as described. That is you could tell they'd been assemblrd on a rifle, but you could also tell the rifle hadn't been fired since it left the factory.