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I have the Holosun 507 green on my Mako. The Mako requires a mounting plate. My research showed this one to be the most reliable fit.
chpws.com
I hope that helps.

Kimber R7 Mako to Holosun 407k / 507k - C&H Precision Weapons
THE MOST MODULAR, RUGGED, DURABLE, RELIABLE AND MOST WIDELY USED AFTERMARKET OPTICS ADAPTER PLATE. PERIOD! PARAGRAPH!! DIRECT MILL YOUR OPTIC CLICK HERE

I hope that helps.