I recently got this 22/45. Im looking to see if any of you have this same model with a sight on it. I have the stock rail on top. I tried another halo sight on it. Only way it would fit was with the sight too far forward for my liking. Im looking to use the stock rail, not remove rear sight, and have the sight mount to the rear of the rail. Wondering if any of you out there have any suggestions on a sight. pics of yours? Also, Im not looking to spend a fortune. the cheaper the better. thanks

Bushnell TRS-25, $80 on Amazon.  They're great for the money, I have one and it works very well.  It's pretty small so you should be able to mount it towards the back of the rail.  I've used it on my 22/45 and put it right in front of the rear sight, but I have a different rail on mine; should work fine with the factory rail though.

Look at primary arms too

The bushnell works great on the 22/45.. Holds zero and has been flawless so far