My M&P 22 had some initial failure to feed, failure to eject and stove pipe issues in the first 100 rounds. Those were because I hadn't fully cleaned the gun, ammo selection and grip.

I learned those lessons and then bought my Shield .40. Cleaned it, proper grip and 100 rounds of NEW ammo through it without any problems.

Should be fine for you as well. Try it out before you start carrying.