So, as stated in another thread, I had my first outing with my new MK9 and got 60 fault-free rounds through it - it performed flawlessly. 60 rounds down, 140 more for it to be considered fully broken in.
Meanwhile, I bought a set of snapcap dummy rounds to practice clearing jams should they happen - and man, that spring is stiff! It's not easy racking the thing to clear a jam.
Does it get easier as the gun gets further broken in?