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I recently put a 507k-x2 green on my Hellcat Pro with a C&H Precision adapter plate.

There is a very small amount of cowitness available.

It’s my first red or green dot and I really like it a lot.

I will warn you that the screws that came with the adapter were too long and I ended up buying the Swampfox mounting screws assortment for $20 after no success at 2 local fastener stores.
 

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You are correct about the length of the screws = .095" protrusion for the Hellcat HS H11
I had to grind down both M4 screws when I mounted a SIG Romeo Zero to my Hellcat 👇
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Nicely done!

With the screws being so small I wasn't sure that I could hold them to grind without damaging the head or threads.

It does baffle me that the screws that C&H provides with their adapter plate specific to the Hellcat and the Holosun 407k/507k isn’t perfect for that pairing.

Oh well, I’m just glad to have it mounted.
 
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