Thanks for the info. I'd like to get ahold of one of the x2 versions if they are ever readily available. I have a 365XL and as I recall those should mount to the XL with no mods, etc. Interested to hear if you have any other issues with it, etc.Holosun 407K. It might have been user error as well.
Seems like it would be a fairly inexpensive way to get into a pistol optic to see if I liked it with what most consider a decent product.
I think T-dogg had one and said he liked it.