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3/20/2017 5:03:23 PM
Posted: 9/11/2011 7:03:05 PM EDT
What is the difference between an A3 and an A4 upper receiver?
Link Posted: 9/11/2011 7:05:31 PM EDT
nothing

commercial market calls it A3, military calls it A4
Link Posted: 9/11/2011 7:14:02 PM EDT
Try Google?
It might be able to answer the M4 cut answer as well
Link Posted: 9/11/2011 7:28:56 PM EDT
The commercial market jumped the gun, introducing the A3 upper before the .mil had adopted an M16A3. They just sort of assumed that the A3 would be a flat top. Turned out the .mil's A3 is identical to an A2 except for having full auto instead of burst. The M16A4 was the one that got the flat top upper. So you've got some companies going by the original commercial term, while others are using the military's term. But on the commercial market, they're the same thing.
Link Posted: 9/12/2011 8:53:48 AM EDT
Originally Posted By JoshAston:
The commercial market jumped the gun, introducing the A3 upper before the .mil had adopted an M16A3. They just sort of assumed that the A3 would be a flat top. Turned out the .mil's A3 is identical to an A2 except for having full auto instead of burst. The M16A4 was the one that got the flat top upper. So you've got some companies going by the original commercial term, while others are using the military's term. But on the commercial market, they're the same thing.

This is correct.
Link Posted: 9/12/2011 3:42:17 PM EDT
Originally Posted By JoshAston:
The commercial market jumped the gun, introducing the A3 upper before the .mil had adopted an M16A3. They just sort of assumed that the A3 would be a flat top. Turned out the .mil's A3 is identical to an A2 except for having full auto instead of burst. The M16A4 was the one that got the flat top upper. So you've got some companies going by the original commercial term, while others are using the military's term. But on the commercial market, they're the same thing.


Thanks for the insight.
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