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Discussion Starter · #1 ·
The 507K is smaller than the 507C, so it won’t fit on the standard #2 optics plate for the RMR. Any options? TIA.
 

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Discussion Starter · #3 ·
I believe the HK plate #4 will work with the 507K.
Unmodified? Because there are only two circular mount holes under the front of the 507K, and not just one in a front corner and a recess for a diamond shaped lug in the opposite rear corner. Have you tried the #4 plate with the 507K?
 

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With Modification, the rear two locater pins on the plate must be filed off in order to allow the 407K/507K to fit. Found this info on mountsplus...
 
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