Just pick up the Sig Mpx K PMPX-4B-9 absolutely love the gun.
after about couple hundred rounds I felt the charging handle wasn't sturdy, kinda flimsy.
I found the Radian Raptor and Next Level Armament, heard both were great. But unfortunately neither website says if it was for the MPX-K. Have email both companies and have yet to heard back. I understand its crazy times but 2 weeks.

Im looking for any help I can get? or if there is another company that makes them.

I have found the Radian Raptor on other sites but again doesn't mention were it will work for the MPX -k

I'm not sure if I can answer the question definitively, but is there a difference in that model that would necessitate a different charging handle, because I'm not aware of one.

I have the Radian Raptor on my 8" and it's s solid improvement over the stock unit.