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Thanks for the link Augee. I've read through that thread and the 727 clone thread twice. Im new to the retro world so I have some questions for the experts. I want this carbine to scream 80s. The BHD thread is more 90s with more modern optics and accessories. Is there any difference in the two? I noticed there are several carbines built on A1 receivers, I have a A2. Also, I have an old Aimpoint MkIII that was discontinued in '89. Right now these parts are going on a spikes spider lower which I plan to replace later on with a more appropriate lower. What light would be appropriate for a period carbine, if any at all? Im looking for expert guidance but since this is an A2 I came here instead of retro.
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The period you're asking about is a period of a lot of changes in a relatively short period - you're really talking about the time period when:
a) the M16A2 Carbine was beginning to "appear"
b) when CT-type units were beginning to switch from being heavily invested in MP5s of various types to M16 carbine types
The A2 receiver wouldn't really be appropriate until about 1988 and on, as that was when the RO727 was released - originally it used a .625 barrel, but those seem to have gone away extremely quickly in favor of the .750 barrel. The A1 and A2/FS RO723s would have been a little bit earlier, but not too much, and unlike the RO723, I don't know if I can recall any documented photographs of the .625 barreled RO727 in use by the military.
Depending on when in the '80s you're thinking, you might be looking at the R653, the M16A1 Carbine.
Between 1983 and 1993, you're talking about a shift between divers' flashlights and D-cell MagLites with hose clamps and duct tape to Laser Devices (Surefire) 6Ps and barrel mounts.
RDS of various types have been in use since at least 1970 with the Singlepoints on the Son Tay Raider GAU-5s (forget how many slashes and "A"s for the correct designation - but it's the forward-assistless XM177E2 equivalent with the 11.5" barrel).
This might be a good article to read if you haven't already:
http://soldiersystems.net/2013/11/19/bcm-gunfighter-history-vol-1-the-scud-hunter-carbine/
Honestly, for what you're talking about - for the first half of the 80s, you're best "A2 Carbine" would be an MP5A2.
For the second half, I'd swap out the A2 upper for an A2/FS ("C7") upper, and then use the parts you've got.
~Augee