Personally Co-witnessing drives me nuts on HK weapons due to the front sight size. I wouldnt but thats just me 
Oops, instead of "why would YOU want co-witness", I should have written "why would ANYONE want co-witness?".I don't WANT to co-witness. But if you raise the scope up enough that it doesn't get in the way of the sight, the reddot/scope would be quite high, lot more than I'd like above the bore.
I second this post, the EOTech works well on the USC/UMP. Just make sure you get a front vertical grip as well, makes it a lot easier to handle.Eh my EOTech on the factory rail works just fine with no cowitness![]()