What is blow back out?

Blowback is a phenomenon that occurs in firearms when gases are expelled during firing and are forced back into the mechanism of the gun. Blowback is a common occurrence in semi-automatic weapons, particularly those firing smaller caliber bullets. Blowback can be problematic as it can result in increased recoil, causing the firearm to be less accurate and potentially dangerous if not properly handled. To avoid this, firearms manufacturers can use various mechanisms which can mitigate blowback by redirecting the exhaust gases away from the shooter.