
Originally Posted by
Iraqgunz
Would you mind clarifying this? Even though they have different NSN's I have not seen a difference between the two and as a matter of fact we converted alot of M16A2's to the M16A4 config. The package called for a flat top upper, rail system and detachable carrying handle. That was it.
Hello,
While the barrels would basically be the same, the difference would be in the FSB's... A2 Barrel = Std. FSB & A4 Barrel = .040 Taller "F" Height-FSB... Correct?
If so, then didn't you have to raise (un-screw) the front sight post approximately .040" or install the .040 taller post in order to achive ZERO when you used an A2 barrel in an A4 upper w/carry handle??? Assuming of course, that it was a Colt® handle (or one made to their spec's) and not an after market with the incorrect shorter shelf where the rear sight assembly sit's.
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