The venom is too big (front to back) for the slide cut.
Get a holosun 407k or 507k depending on which dot size you prefer, the rmsc plate included with the mete will require the rear lugs being sanded flush, and you'll be good to go.
I have this exact combo. It is excellent. It takes time to get used to "finding the dot" but watch several of Sage Dynamics and Modern Samurai Project vids on YouTube and you'll get some good pointers.