Got Surefire's newer 45° mount today. Great little piece. Attaches to the light via two T15 torx screws, vs. the tiny screws (T8?) that the factory mount attaches with, and the cross bolt threads into a "cleat" as they call it, rather than the mount itself. So if you strip the "cleat", or just cake it in Loctite after a few years of use, it's simple to replace, rather than replacing the entire mount. I've not had a lot of issues, but having stripped out an IWC/HSP Thorntail in the past, and having to wait for a replacement, I do like the modularity of it.
It also is very light, and sits very tight to the rail. The HSP stuck it out and slightly up, where this just sticks it out, so there's a little less of the light in your FOV. Not a big consideration for AR's, but nice with the Ultimak. I really like it.
Looks thick in the second photo, but I don't see any of it through the optic or with the irons. Completely unobtrusive.
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