I would like to see a picture.
I have one of those early Colt 604 Air Force issue uppers, in pristine shape no less... actually it's the entire parts kit, installed on a semi auto lower. Square forge upper, no forward assist, Colt proofed non chrome lined barrel, pencil profile with 3-prong flash hider. It has chrome lined full auto bolt carrier, and the old style takedown pins, selector switch, and bolt release. I love how that thing handles... I have plans to send my A4's barrel off to Adco to get milled down to the same profile... I am not a fan of the backwards-ass gov't profile.
It is the bottom one in this pic:
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