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1/30/2004 11:36:15 AM EDT
What is the difference between an A3 upper and an A4 upper?
1/30/2004 11:51:49 AM EDT
[#1]
nothing.  if you're talking complete upper than the A4 wouldn't have a front sight.  

i could be wrong but i don't think so.
1/30/2004 6:31:26 PM EDT
[#2]
Anyone else?
1/30/2004 6:39:45 PM EDT
[#3]
1.

What'd I win?  What'd I win?
1/30/2004 6:47:05 PM EDT
[#4]
[LOLabove]
1/30/2004 6:47:05 PM EDT
[#5]
...or no wait A3-A4=A

A,  

[b][size=5]A![/size=5][/b]

That's my finale answer.
1/30/2004 8:35:56 PM EDT
[#6]
Here is a copy of one of the questions from Armalite FAQ site.

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WHY DOES ARMALITE CALL THEIR FLATTOP RIFLES "A4" INSTEAD OF "A3" LIKE OTHER MANUFACTURERS?

Because ArmaLite tries to follow military designations to avoid confusion.   The M15A2, for instance, is a commercial version of the M16A2 rifle, and is not capable of automatic fire.  The M16A3 model is like the M16A2.  The only difference is that the M16A3 is equipped with semi/auto settings on the selector, while the M16A2 has seim/burst settings.  The military M16A4 is like the M16A2, but is equipped with the flat topped upper receiver equipped with the Picatinny Rail.  Other commercial rifle makers adopted the A3 designation for their flattops without knowledge of the military plans.
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I hope this helps.
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