Just bought a Bushy... now a Question.


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PUMC_TomG
November 27, 2004, 12:42 AM
I just bought the Bushmaster "M4" with the A3 upper. I am messing with the rear sight trying to get it set to zero, and I notice that whenever I set the rear aperture to lower elevation settings, the aperture begins to sight slightly left of the front sight post. Conversely, when I set the elevation for longer distance the rear sight begins to aim slightly to the right.

Is this considered normal for the Bushmaster rear sight on the removeable carry handle?
Hopefully I won't have to deal with this twisting aperture issue with an ARMS #40.

Also of concern is I'm not sure that I have it set for zero correctly. There is the small mark above the 6/3. Then I can click it over once and it seems mostly centered over the three. Then once more again and it is over the Z. Therefore I am not sure if the actual 300m zero is the indentation, or the click to just over the 3 of the 6/3 because Bushy says to go ONE click up from the 300m point to zero the rifle. If the Z is the 25 meter zero point... then the notch on the elevation knob is actually TWO clicks away.

I hope that last part made sense.

If anyone could help me out I'd appreciate it.

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Steve in PA
November 27, 2004, 01:07 AM
Go here The Maryland AR15 Shooters Site (http://groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw) to learn all about sighting in the AR-15 rifles.

PUMC_TomG
November 27, 2004, 02:21 AM
Thanks Steve,
I didn't think about that hex screw to get the elevation knob fixed. Looks like I'll be using the IBZ from now on - looks like a winner for my purposes.

I'm still not happy about the "flex" of the rear aperture with the elevation adjustment - but hey... it's getting replaced eventually. :)

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