DM premium optics 3x magnifier mount options?

[jdk32581]

So I am thinking of purchasing an EOtech 517 and a DM 3x magnifier from a friend. Both are in like new condition he is asking 450$ for both. The only problem is the mount for the DM 3x is a fixed mount. Anyone know what my options are for a FTS mount? Would greatly prefer FTS mount. I have heard some negatives about Primary Arms FTS mount as well as the Samson FTS mount which I THINK will both fit the DM 3x magnifier? Are there any other options? Checked Larues website but cant seem to find anything. Any help would be appreciated

Thanks

Joe