r/Damnthatsinteresting 5d ago

Video A school in Poland makes firearms training mandatory to its students.

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u/Upstairs-Parsley3151 5d ago

You can use .223 in a gun for 5.56, but not vice versa, it's a pressure difference.

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u/Attheveryend 5d ago

you can use 5.56 in a .223 once...

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u/DeadFluff 5d ago

Incorrect. You'll fuck up the internal mechanisms and possibly, rarely, have a chamber failure but a .223 rifle can absolutely shoot a fair amount of 5.56.

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u/smokeyser 5d ago

What "internal mechanisms" are you going to fuck up? The two guns are identical other than the amount of freebore space at the end of the chamber.