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Posted: 10/24/2012 8:16:23 AM EDT
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Does anyone know if a A2 front sight post will work in a A1 upper?
My brother has a A1 upper (uses the 5 prong tool) and he wants to add a trijicon tritium front sight post. It is a lot easier to find one for an A2 front sight. |
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They are interchangeable. The threading and recess dimensions are not different between the earlier blasters, and the M16A2.
The sight tools are different, because the A1 has five notches, while the A2 has four. I put a fiber-optic front sight in my RO727 build, and it helps you to aim smaller. My BIL and nephew were able to hit a steel gong at 400yds with it this past weekend, using 55gr M193. |
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thanks
I am going to order this for him then http://www.brownells.com/rifle-parts/sights/sight-sets/fits-ar-15-a1-a2-w-10-36-windage-screws-sku892415025-41695-32005.aspx |
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Quoted:
They are interchangeable. The threading and recess dimensions are not different between the earlier blasters, and the M16A2. The sight tools are different, because the A1 has five notches, while the A2 has four. I put a fiber-optic front sight in my RO727 build, and it helps you to aim smaller. My BIL and nephew were able to hit a steel gong at 400yds with it this past weekend, using 55gr M193. Thanks brother. Isn't it crazy how you can forget something like this? I the post wasn't frozen with rust I would not have asked. Much prefer the A1 post over the A2, but I'm getting older - there's a reason they changed it, likely at the behest of the USMC. You can bitch all you want, but those guys know rifles. 
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