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1/25/2018 7:38:29 AM
Posted: 9/10/2002 9:00:38 PM EST
Just wondering if any of you have had problems with the large aperature being drilled off-center on the ARMS flip-up BUIS?

I recently installed one of these to complete my SIR-M and the large aperature (0-200) is off to the right of center. The small aperature appears to be perfectly centered.

Cam someone fill me in on whether or not this is normal? Thanks in advance.
Link Posted: 9/11/2002 6:55:29 PM EST
All milspec A2 leaf apertures are compensated to allow for the shift on the thread when going fro one to the other, alignment in shooting zero is the same. Normal!
Good shootin, Jack
Link Posted: 9/11/2002 8:27:43 PM EST
Thanks for the insight Jack.
Yeah, it makes perfect sense that there would be some windage shift as the aperatures are rotated between large and small on the horizontal sight screw!
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