Had rear screw break on mount, cantilever, after shooting this weekend with new suppressor. Haven't had a problem with it and looked and it was gone and looking it up not just a replaceable mounting screw it's a proprietary that's non removeable. Called Sig and had to send in whole thing and rep said they didn't have any of the mounts and recordings warned of delays.....bottom of unit said Made In China so no idea how long this is going to be, I probably should have just gone and bought a new 30mm mount or took the one off my night scope......Torqued to the 65 it said when mounted. AR 10 .308. I hope with Sig making the new military weapon system they don't rely on China for any components.