Any reason this should be happening? It's on a brand new Stag 2H upper on a aero precision lower... Everything as it was basically straight out of the box... It was hitting waaaay left at 25 yards so I adjusted it and moved it all the way to the right and even after moving it all the way it's still hitting slightly left... and I can't switch between apertures.

Check the front sight post alignment, something is not right.  As long as you didnt have 50mph cross winds while you were shooting..

The front post looks alright... I don't have anything to take accurate measurements with but when I look straight down the rifle from behind and above I can see the ears of the sight aren't quite aligned/centered with the rest of the rifle. I had an AK with a canted FSB so I know what that looks like when it happens. I tried taking the BUIS off and moving it around but it didn't change anything... I'll try to take a picture to show what I mean...

Here's a picture... blue is the center line of the rifle, red is where the "ears" of the sight line up at.

Xpinchx
we will send you another sight to see if it is actually the sight. please give the shop a call so we a can get your info.
thanks
TROY
MI

I

Hmm, thats odd.  I have one of those sights as well and I had to adjust mine all the way to the right to get the rifle to zero.

I just figured my FSB was slightly canted but since it's working I didn't mess with it. Now I wonder if it isn't the sight since you have the exact same issue I do...

ETA: Mine lines up the same way yours does in that picture.  After looking at my FSB, it doesn't look canted, it looks like the BUIS just sits to the left of center on the upper.

the sights sit in the center . if you have a problem call the shop.
TROY
MI

I took another quick look at it before I called earlier and it appears it's not mounting level. Here's a quick pic with the sight folded down and a level on the base. The rifle itself isn't perfectly level on the table but I checked with a level on the rail and it was only +/- 1 degree. The sight appears to be off by about 5ish degrees. I guess I'll find out for sure what's going on when the new sight gets here. Thanks for the quick service, I'll be sure to keep you up to date on what's going on.



p.s. what size is that allen screw? I have metric and SAE wrenches but couldn't find an exact fit.