I had a utg mount on my m305. Came with it when I bought the rifle. Didn't like it at all. Got the m14 casm mount and couldn't be more happy. Yeah it does mean losing the rear irons but I was okay with it since I was scoping my m305. If you want to keep your rear irons, SE and Sadlak are excellent mounts. But keep in mind, depending on how your rifle is ejecting the spent casings. Mine was ejecting them constantly at the 1-2 o clock position which would cause stove piping when spent casings would hit the mount. If your rifle is ejecting more to the 4-5 o clock position, then a low mount would be fine. You can attempt to rectify it by either cutting 1-2 coils from the ejector spring, or replace the ejector and ejector spring with usgi or replacing the extractor with a usgi. I tried toying with mine but had no luck with it so, I decided to ditch this cheap mount for the m14 casm mount with sits high enough for the spent casings to clear the mount. Of course, sitting high means I had to get a cheek riser.