I believe ammo can be an issue. M1A "hates" South African surplus 7.62X51 ammo. It will regularly bounce an empty off the bottom of the scope mount (that has been on my rifle since the late 70's) back into the receiver resulting in a jam. My reloads are okay. Winchester hunting ammo was okay. S&B surplus is okay (corrosive, but functions 100%).
Sometimes, the gun "speaks" to us, if we're listening.
Just keep buying/using ammo that works in your pistol.