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Posted: 9/6/2010 2:25:16 PM EDT
Searched around a little but couldn't find what I was looking for. I have a flat-top M4 build that needs a new upper receiver. I was thinking about replacing the flat-top with an A1 upper. The gun already has an old school Colt Type 1 stock on it, so I think it will make for a nice KISS rifle. Just looking for some pics if anyone has one set up like this. Also, would this be pretty similar to what the IDF uses / used? I don't know much about them. Did our military ever use M4 barrels on A1 receivers? TIA
Link Posted: 9/6/2010 2:32:03 PM EDT
Not an A1 upper, but a 604 upper (lacks forward assist). I believe I have seen A1 uppers (forward assist) with M4 profile barrels before, though.


Link Posted: 9/6/2010 2:36:26 PM EDT
Model 723 from the Retro forum

723 with A2 profile barrel and M203 cut

Commonly referred to as a M16A2 Carbine, slang as "CAR-15" or "M4", 8 million serial number range, 1987-?:


Link Posted: 9/6/2010 2:39:30 PM EDT
Link Posted: 9/6/2010 3:08:51 PM EDT
It has a standard front sight base, not F marked. It's a RRA barrel.

Originally Posted By Lancelot:
What front sight base does your barrel have?


Link Posted: 9/6/2010 3:11:05 PM EDT
Thanks, I was wondering if it had a specific model number, so that answers that question. I see that one has the smaller handguards, I have a spare set I could put on to make it more "correct"

Originally Posted By Frens:
Model 723 from the Retro forum

723 with A2 profile barrel and M203 cut

Commonly referred to as a M16A2 Carbine, slang as "CAR-15" or "M4", 8 million serial number range, 1987-?:

http://img.photobucket.com/albums/0603/Ekie12091941/Govt%20Carbines/variation%20guide/upperassy11.jpg



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