That's what I call a sense of humor, muggsy.
That's what I call a sense of humor, muggsy.
Right on, it is the result of ejection. I noticed that the case is dirty on just next to the side that the ejection smear appears. My theory is some residual gas from the firing travels along the side of the cartridge beginning its exit. Just an idea.
The short barrel guns probably unlock earlier due to higher slide velocities (lower mass slide), AND short barrels change angle more to cam down at unlock. So I would expect the smear to be much worse on a MK9, and no smear on a T9.
https://m.youtube.com/watch?v=0RhjvVeeH8s
Watch this, it will explain the phenomenon on striker fired and other pistols.