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9/22/2017 12:11:25 AM
Posted: 9/14/2005 3:36:35 AM EDT
I am finally finishing up my first build and am preparing to hit the range. I've got a Del-Ton M4 flat top and bought an A3 Type Removable Carry Handle. The elevation knob on the rear sight is marked with a 6/3. I thought it should be marked as 8/3???
Link Posted: 9/14/2005 4:20:52 AM EDT
iirc one is for the m4 and the other a4?

Link Posted: 9/14/2005 4:25:12 AM EDT
iirc = ? Sorry, I'm new to forums in general.
Link Posted: 9/14/2005 4:28:08 AM EDT
Link Posted: 9/14/2005 4:36:30 AM EDT
Got it. Thanks. The part that confuses me is that I look at the Bushmaster manual for all XM15 rifles, it has the exact detachable rear sight identified. When I go to the zeroing procedure for the detachable A3 version, it says to set it to 8/3. But their own hardware (or at least the one that I bought from them) has 6/3 stamped on it. That seems odd to me. I believe the 8 represents 800m. So does the 6 represent 600m? Or did I get one with a marking problem?
Link Posted: 9/14/2005 4:49:22 AM EDT
I'm guessing that it's simply unique to the A3 configuration and should be 600m. Assuming that's the case, my next guess is that I'd zero the same as the A2 procedure.
Link Posted: 9/14/2005 5:07:45 AM EDT
I contacted Bushmaster and got my answers. Here they are in case anyone else has the same questions -
From Bushmaster:
The A3 sight base has a shorter throw as the elevation stem of the base is not as long as the A2 sight base and can not be raised as high. It is also 1/2 MOA elevation instead of 1 MOA of the A2. For that reason you need to click up twice to the "Z" mark to zero at twenty five meters. The index marks are also twice the distance as the marks on the A2. Going past the 6/3 to the 4 mark again would be for 700 meters. It will not go high enough for 800 meters. The small aperture is still used for 300 and longer meter ranges.

If the longer A2 rear sight base were installed in the A3 handle the threaded portion of the sight base would stick out of the bottom of the handle when in the lowest most often used position so that the handle could not be mounted to the flat top receiver.

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