Don't rack it!
Theoretically, and in actuality, you rarely have to rack the slide on a semi-auto pistol. Sound crazy? Well, think about it.
When you buy a new gun, you will need to lock the slide back. Then, other than a few occasions, that could the last time you need to do it. Just follow these procedures-
1. Once locked open with the slide stop engaged, insert a loaded mag. Don't attempt to press the slide stop down, it's a slide stop, NOT a slide release. It will work as one, but why? Remove an empty or no magazine, insert a fresh one, hold the gun in either hand, pointed safely, and grab the extreme back of the slide on the sides, by the rear sight, whatever and pull back a slight distance, then immediately let go. Hold on as the full power of the recoil spring will slam the slide forward and feed a round off of your loaded, full, and inserted magazine.
2. Shoot the gun until empty or if practicing, save one or two, remember it's not dry, remove the quasi-dry or not mag, insert a new one.....start shooting again. Do that all day, never rack the slide.
3. At the end of the day, shoot your last magazine dry. Remove it. Check the chamber for empty. Then put it away, slide locked to the rear. It can remain locked to the rear for, guessing.....fifty years. Then next time you use it, see #1 above.
4. Cleaning- The Shield is a magnificent, reliable firearm. One of the reasons is it has few, tight tolerances. Tight tolerances need regular cleaning. A plastic gun is sloppy by comparison, and actually that is a good thing! It doesn't need cleaning after every range event! It doesn't. You can shoot 500 or more rounds through this great weapon and never clean it. That said, don't do that. But you don't need to ever disassemble it! Yes, never. There are wonderful aerosol cleaners that strip every bit of residue out. All you need to do is clean the bore and the bolt face. Bolt face with a light cleaner and a tooth brush. Every time is good, but not essential. As far as lube points, all can be reached WITHOUT disassembly.
So, with all the above, you have not once racked the slide to the rear other than the first time when you bought it.
Practice makes perfect!
Note- do none of the above with a precision, target, competition firearm. But the Shield is a different animal, and as such, works with simplicity with a common sense owner.
Jim