I purchased the 45 degree offset flip up sights from Primary Arms.  I put the rear right on my rifle to check fit, and it didn't work!  I have a Spikes upper and a Geissele Super charging handle.  The sight will only attach in the T2 slot since the brass deflector will not allow it to be in the T3 position.  With the sight down, the Geissele charging handle will contact the sight preventing the bolt to go into battery.  What do you recommend?

You may consider moving it forward on the receiver just aft of the H.G. ???

Thanks for the advice PA Nick, but my scope is on an AERO one piece Ultralight mount and to move it forward I would have to mount the sight on the HG its self forward of the scope. That wouldn't be good.  I received a email from Primary Arms authorizing me to return the sights.  I'll just have to find another way to have BUIS on this rifle.

Alright, here is the resolution of my problem.  The Troy sights did not fit my rifle.  I purchased AT3 Tactical 45 degree offset sights and a Blitzkrieg Chevron Luminescent sight post (green) and it works perfectly!!!  The only concession I made is the sights are always up, and don't recline.  I think I can live with this, since there is so much room from the rear sight to the charging handle.

So, I had the same issue with these sights and a couple of PSA upper receivers.

They worked on a LWRC and Colt upper but not the PSA or RRA upper.

The issue is the slip on versus clamping mounting solution. Nice sights but not optimized to fit most uppers.

I bought them for my HK416 clone I’m building and they do not work with that upper as well. In back of brass deflector, no finger placement for RH charge lever. Won’t go directly over deflector without modifying sight or upper. In front of deflector, acts as deflector. Not keen on the option of putting on rail, like the longer sight  radius. Not sure if I will keep them. I have an MR762 I need to pick up this weekend, may work on that with the longer action?