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Posted: 6/15/2009 1:16:37 PM EDT
| I just picked up a slightly used a1 upper off the EE. My question is in regards to the rear sight assembly. It appears to be the sight of an a2. it has a large aperture marked 0-2 and a smaller unmarked aperture. Are the a1 and a2 apertures the same? We have older colts at work with a1 uppers and the sights seem different? |
I actually swapped the DPMS version of the A1 (no "L" aperture - two holes that look the same) that came with the new sight I added to the upper (stripped when I got it) for that A2 aperture. I still have the A1 in my parts box if you want it, although I see I may be a little late. 
I am trying to buy another C7 upper with M4 ramps now (that's how I found this thread).  If you don't need that one, please let me know.
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My M16 clone has te original aperture. Some years back I enlrged the short range sideof the XM177 clone a bit, but the current "go to" piece; a Commando/ Israeli carbine clone has an A2 aperture; and a square front post.
Some of the current updates are, in fact, worth having 
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Quoted:
Some years back I enlrged the short range sideof the XM177 clone a bit I did the same thing. In addition to "low light", the large peeps are also good for CQB. I think that's why many of the A2 apertures are marked "0-2" under the big peep (0 to 200 yards). Or am I way off?
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Quoted:
I think that's why many of the A2 apertures are marked "0-2" under the big peep (0 to 200 yards). Or am I way off?
No, you're right. The hole on the 0-200 meters settting actually ends up making the rear sight lower (the hole is lower in the center), so the bullets hit lower than the small peep. It has a 2.5-MOA difference. When you zero with the small peep at 300 meters, flipping to the 0-2 aperture gives you a 200-meter zero for closer targets. See this thread for more detailed info. |
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