300 BLK Through 5.56 Barrel
The results of firing 300blk through a 5.56 barrel.
That’s a projectile stretched in the center section.
Shooter was unharmed, mag blew out and gun was damaged.
Source: https://www.facebook.com/JCWeaponry/photos/a.191088200956321.46019.123855004346308/626635837401553

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Little overpressure?