When I carry a pistol,I always carry a spare mag. The reason being that on one of my many required Federal requalifications (2 per year) I had a type 3 failure (Double feed) that requires you to lock back the slide,rip the mag from the mag well (throwing it to the ground),racking the slide to clear the spent round and inserting a fresh mag.

As stated above, the problem could be the mag so you would want a fresh one. It only takes a few seconds to do an emergency reload.. Don’t bet your life that it can’t happen to you.

My mags are 8 rounders. 6 with one in the pipe and a spare mag would be ok. JMO.

I carry a J frame size revolver with 2 speed strips for spare ammo most of the time but a 9mm shield with a spare mag sometimes ( I have had two of the above mentioned failures over the years with different pistols).

Be SAFE and shoot often!