judgement mistakes
Reduces barrel fouling
Look on the barrel, it will be marked with the correct ammunition.
Look on the barrel, it will be marked as to the proper ammunition.
It is marked on the barrel.
Have a barrel of water near ammunition
If the barrel has 5.56 printed on it or you have verified with the manufacturer that ALL of their barrels are good for 5.56 ammunition.
Should be marked on the barrel. If not, take it to a gunsmith.
It should be marked on the barrel.
A backfire is an act of firing in the opposite direction to intended, for example, a gun being obstructed in the barrel.
Have a barrel of water near ammunition
It should be marked on the barrel
DO NOT ATTEMPT TO FIRE MODERN AMMUNITION until a good gunsmith checks it out.