The EGW TRIJICON RMR / SRO, HOLOSUN 407C / 507C MOUNT FOR SIG SAUER P220 10MM HUNTER, #49528, fits the P220 Match Elite .45. Sig will tell you there are no mounts for the .45 but it’s the same. It’s a tight fit, but so is the adjustable iron sight. The EGW part fits without modifications. It was also too wide for my sight pusher, so I had to tap it into place with a rawhide jeweler's mallet. The 507C mounting plate supplied with the new Holosun HE905 fits the EGW 49528, so it is possible to mount an enclosed red dot sight on the P220 .45 Match and Match Elite, as well as the 10mm Hunter. Removing the Sig's adjustable sight is also difficult - you need a robust sight pusher. Of note, is that there is a set screw under the sight, accessed by removing the height adjustment screw. A sight pusher is then necessary to push the sight out of the dovetail. Use caution because the spring for the firing pin safety block is underneath the sight and must be captured when removed. Also, ensure to lift the sight blade clear of the slide frame as you push. When mounting the EGW, stop about halfway over the spring receptacle so you can slip it in under the mount before pushing further. One caveat, the HE905 Holosun on the EGW mount ran out of elevation adjustment at ~7 yards, so I'll need to deal with that either through sight picture compensation, or a shim. In summary, EGW makes a high-quality product that helps some pretty esoteric pistols be able to use a red dot. The difficulty is determining if the red dot of your choice will have enough adaptive capacity to be a good match.

Excellent product, nicely machined and finished, secure and easy to install. Worked with the Trijicon sight well.