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Posted: 10/14/2003 8:34:57 AM EDT
What's the difference?
I've heard the "a" won't work with an ACOG, otehrwise which would be the better choice overall.

Link Posted: 10/14/2003 9:16:44 AM EDT
The only difference is the aperture. The #40 has a "horizon line cut" in the small aperture. The #40a2 just has a standard A2 aperture.
Link Posted: 10/14/2003 9:54:01 AM EDT
[Last Edit: 10/14/2003 9:55:59 AM EDT by SMGLee]
[img]http://www.thermaldynamics.com/pictures/%2340.jpg[/img] #40 [img]http://www.thermaldynamics.com/pictures/%2340a.jpg[/img] #40a If you are mounting the ACOG directly to the flat top with an ARMS #19, the ARMS #40a will have a hard time getting below the scope, but the #40 will work fine with an ACOG.
Link Posted: 10/14/2003 10:46:47 AM EDT
I had a hard time getting a good sight picture with the shaved aperture. The #40A worked fine with a compact ACOG.
Link Posted: 10/14/2003 10:51:43 AM EDT
My 40A works fine with my TA31 on my 19S... of course there is some degree + or - tolerance in all the components. So if the tolences stack in the wrong direction, it might not fit.
Link Posted: 10/15/2003 4:23:03 PM EDT
[Last Edit: 10/15/2003 4:39:43 PM EDT by PhillipKP]
Does the ARMS 40/40a flip up or are they fixed sites? Do you guys think I could fit a ARM 40a with my TA11?
Link Posted: 10/15/2003 6:50:09 PM EDT
They are spring loaded flip up, fold down and lock. Jack
Link Posted: 10/15/2003 7:53:49 PM EDT
I prefer the A2 over the standard #40, because I find the horizon line distracting and it hampers my sight picture.Besides the small peep of the #40 is identical to an A2 sight which I'm used to and comfortable with.
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