I've got an ARMS 18 mount on my shorty Norc 14, with the folding stock. I've also got an Eotech 555 [ AA batteries with ARMS dual throw levers ]. For reasons known only to ARMS, the two throw levers on the Eotech 555 will NOT line up with the slots in the ARMS mount rail ... the rail is just !@#$%^& too short.
K for all of you holding of on mounting your eotech to this ARMS 18 mount. I did it and its 100% soild like a rock! there are two little clamps located on the bottom of the mounting bracket that you need to bend forward. Then remount and repeat this process in little steps untill it turns soild as a rock!
If you need more info please pm me and I will be glad 2 help.