Failure to zero Vortex StrikeFire red dot

[delta9]

I have a Vortex StrikeFire red dot that was zeroed on my M&P 15-22. I've moved it to my AR-15 and took it to the 50 yard range today. I first adjusted it to co-witness the iron sights and my shots were pretty high. I then took the upper off and tried to bore sight it but was having difficulty aligning the barrel using sandbags and when I finally did get it set, I couldn't then couldn't even get on paper. At this point I gave up and put my Nikon scope back on and was shooting nice 2" bullseye groups.

Any suggestions for zeroing in my red dot on my next trip to the range?

[kcheung2]

You have iron sights already zeroed? The Strikefire is at cowitness height? Then you should be able to zero it at home without firing a single shot. Just line them all up.

[delta9]

You have iron sights already zeroed? The Strikefire is at cowitness height? Then you should be able to zero it at home without firing a single shot. Just line them all up.

That's what I'm not understanding - I had the rear BUS up and had the red dot set to co-witness and was on target. When I flipped down the rear BUS and aimed with just the red dot my shots were high.

[Litespeeds]

I don't think the bore sighting lasers work that well. If you can't figure out where you are hitting at 50 yards, my recommendation is to go to 25 yards and do a few shots and adjust from there. Then move out to 50 and see where you are at. Good luck.

[mjmagee67]

Walk it out on paper. Cowhitness is a great theoy but. Put your sights down and sight your red dot. Then turn off your red dot and sight in your irons. They are two independent sighting systems.

[teflondog]

Make sure to use the small aperture on your rear sight if you aren't already doing so. The big aperture allows more error when cowitnessing optics.