SR9 1.1 here with round magazine release bought more than 2 years ago. Yes, they are stiff out of the box.
Disassemble and clean. Clean striker channel too if you feel competent.
Dry fire the gun and practice racking the slide. Here's the secret in one word (plus three):
Velocity. (And Surface Area)
1) It gets easier after a few hundred cycles as said above +1 to Conn AK. Not tremendously easier, not flopping around, but not as stiff. Even after that, it's still a "tight" gun.
2) Use some SNAP in your motion when racking the slide. Don't tug on it lovingly like you want to ask it out on a date and woo it into racking

. Grasp it firmly and put some *momentum* into your motion. Use some of the fast-twitch fibers in your arm and shoulder muscles and you will find that a firm grip combined with a swift pull will not only rack the slide better but it will also miraculously scrape off less skin on those slide serrations, which really are a little too sharp for their own good. Try to grasp the serrations with enough area of your fingers/hand that you're spreading the force around.
If the slide serrations REALLY bug you, take a dremel and stone the edges *very* lightly. They're cut sharp from the factory. Actually I think looking at them/feeling them causes new owners to "baby" the gun and exacerbates the problem.
It did with me when I first got mine.
"Those look sharp, better not pull too hard or fast..."
"Yeah, pull slow and don't grip it well, so they can either dig in there real good like or scrape off a lot a stuff...." :lol:
The key is to practice it a few dozen times. Get a lot of surface area on there, firm grip, and remember the Laws of Motion: kinetic energy increases at the square of the velocity, so put extra velocity into your motion. Amazingly with this technique you also treat your hands better.
There's nothing wrong with your gun. Mine was the same way.