Hi guys, I recently picked up a Colt AR-15A4. It's my first carry handle.

Using a bubble level the front sight seems level as is the handguard and rail on the upper. When carefully mounted, the top of the carry handle isn't level -- and that doesn't seem like a big deal.

However, the rear sight has some play and is oriented toward 11 o'clock. Is there a way to straighten it? It took 9 clicks to the right to correct the windage at 25 meters and one more at 100 yards. That seems excessive. Snap sight picture is awkward with this setting too.

https://photos.app.goo.gl/rouW4v4dzJLV1f5T8