Good question... Besides having the inside bore engraved on one flat side, it could be to remove it from the barrel if stuck... But most of the times the inserts stick to the body, hence the round holes to remove it.
But if someone would remove the barrel o-ring, it might be possible to have it get stuck onto the barrel.. Maybe that's why the flat faces are there? Not sure though, but i would definatly like to know!
being in battle! I love the moment when my marker stops being a machine and becomes part of me! My blood boils
and my mind goes all white!
It's an incredible high!
There's no time to think, only action!