Originally Posted by caddy2507

The one and only time something like this happened to me was under the following
circumstances. This was about 15 years ago when I was shooting with a friend and
he asked me to try his "new" Glock 17 that he purchased used from a guy.

After firing 2-3 rounds normally the pistol literally exploded in my hand
and hurt so bad that I was afraid to look. My hand was totally bruised,
black but no further injuries, The Glock polymer frame had literally cracked
from the slide on down through the grip frame. A very similar break like
shown on the M&P in the film.

My friend told me that he was using some reloads that the guy gave
him "as a bonus" who sold him the pistol. I believe it was likely a
double charge.

I just wonder what kind of ammo was being used in the M&P shown in this film.