As others have stated, it could be ammo, mags, recoil spring, or other things.
I've seen where people failed to load the mag correctly. That is they will try to load the mag by trying to get the rounds to pass through the mag lips instead of loading a round under the mag lips. Spreading the lips of the mag will cause malfunctions.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)