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Hi Al, the width is 21mm according to SCCY Customer Service : (386) 322-6336 or (866) 729-7599. Cheers and stay safe!

21mm rail

Al, it's a standard picatinny rail Wich is 21mm. Hope this helps.

Well, looks like we have a winner at a width of 21mm!!! Good Luck!!!

Al, I just measured mine and it is just over 13/16" wide which is consistent with the .835 width of the picatinny rail. Have a great day!