These are for guns that utilize the gun's stock as the grip, such as the Mosin, PPSh, SKS, and etc.

Instead of the barrel pointed down, and then the stock n' yow hand forced in front of yow face while running. Just invert it, the stock pointed down, and then the barrel is pointed up.

If it's complicated, don't bother lol. Goofy ahh stock running animation ain't that bad anyways.