The 507K is smaller than the 507C, so it won’t fit on the standard #2 optics plate for the RMR. Any options? TIA.
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?I believe the HK plate #4 will work with the 507K.