A1/C7 upper receivers are very hard to come by these days. They have become more "in demand" since the retro craze has really taken off the past few years. The upper assembly you show would be a good choice to get the A1/C7 upper you want. You can always sell off the barrel assembly and the handguards and keep them for future use. If you want to use the barrel, you would most likely have to have it re-profiled to .625" and get a corresponding .625" FSB installed if you want it to be correct. If not worried about being exactly correct, you may be able to have the barrel cut down to 11.5" and have it rethreaded. One thing you will need to do is find a large head forward assist for it to be a correct 733 setup. These are also hard to find these days. You could get away with a standard round forward assist. The CAR 6-hole handguards are out there. I have a couple connections that may have a set or two. A repro fiberlite CAR stock is available from Model 1 Sales (kit w/ 4-pos. buffer tube) and M&A (stock body only). The 733 did use a 2-pos. buffer tube like the 723 and the XM177. These are available from Nodak Spud. As for the lower receiver, you will see them mostly with A1 lowers, but some of the late models may have had an A2 lower.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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