I wrote Holosun and asked them directly if the Holosun 407k x2 would work with my S&W M&P Shield Plus 3.1". A Daniel Sosa with Holosun wrote me back and said "yes". I then purchased the optic.
When I read this post I immediately cancelled my order. I am not going to void my warranty over an optic.
I do see that there is now an Holosun 407/507k to Shield rmsc adapter plate, but that would add another $63.00 to the optic cost. As much as I would like to have the 407k, I'm not doing it on principle. They could have got it right, but they didn't. As another poster said, they screwed the pooch on this one.
I'm really aggravated about this.
