Sweet setup!
So how quiet is it with the MK9K and how's the balance as well?
I was considering a similar set up but I can't seem to find a Gemtec MK9K anywhere for sale.
Very well done.

I don't have a dB meter or anything but I do know it takes a lot more rounds to heat up in comparison to the standard pencil size 9mm suppressor.
Balance wise, it is a fat dude, so it sorta acts a bit like a compensator with the extra weight up front.
The MK9K is not widely advertised or even stocked as its sort of a niche can. It was originally designed for fully automatic weapons like the MP5. To put things in perspective, it has a 2" outside diameter. There are a lot of .50 BMG and .338 suppressors that are not even that big. lol
My dealer back in January of last year could find ONE in stock out of all his distributors and it had a 1/2 x 36 cap (old school 9mm thread pitch). I said I don't care, get it for me. lol
Not pricely at all, only cost around $600 if I recall. Gemtech still shows them on their website, but my guess is they either produce very small quantities now a days or maybe even stopped production.