I got the apa twister safari on my ultra mag. I load mine from the front, seems to be easier. The only complaint i have with it is you can only move it up so far, and i'd like to be able to move it up more, that way i could move my sit pins up further since my 20 yard pin is in the middle of the circle. I suppose I'll live though. Excelent site, love it other than that one thing.