View Full Version : Sighting in help - BUIS and optic don't match

06-11-2012, 1:29 AM
I went to go sight in my new ARMS flip up and my eotech 517 today. I decided to do a 50yd zero, so I got a good group with my irons, then I put the red dot on the tip of my FSP, still using my irons. Shot a few rounds and they were low and left, so I adjusted my eotech and again got a good group at 50.

The strange thing is that now when I sight in with a cowitness, the eotech is up and right compared to the irons.

I shot back and forth with irons and the eotech, both were on target and zeroed well, but they dont match up...

Any ideas?

06-11-2012, 1:47 AM
Hmm... Looking at it more, it doesn't seem as off as I remembered it bring off at the range, it's off by just a little bit. I guess I'll go back on tuesday and see if it's any different. There were some wind gusts today...

06-11-2012, 5:52 AM
My aimpoint with a 1/3 co witness is the same, just a little off on the irons.

06-11-2012, 12:00 PM
Don't worry about it, irons and your RDS will rarely line up exactly.
You're not supposed to line the dot up with anything but your target while shooting anyway.