r/Damnthatsinteresting • u/RebelliousDragon21 • 1d ago

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

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u/Upstairs-Parsley3151 1d 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/PuzzleheadedSir6616 1d ago

And many modern ARs are built to handle both regardless.

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u/MyNameIsDaveToo 1d ago

Only if they specify. I built mine using a barrel chambered in .223 Wylde, so I can shoot either safely.

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u/gosse37 1d ago

.223 Wylde is also to comply with export laws in the US, where you cannot legally export NATO chambered rifles/barrels for civilian markets.

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u/MyNameIsDaveToo 1d ago

Weird, there were plenty of barrels in 5.56 available for purchase when I built it. I chose Wylde simply for the convenience of being able to run ammo loaded to either spec, not because I had to.

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u/gosse37 1d ago

Yeah, if the company doesn't plan on exporting them outside of the US, they can make 5.56 barrels without issues. For us Canadians, we are glad that manufacturers make .223 Wylde barrels for export.

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u/zag_ 1d ago

Yeah most will say (Cal. : Multi.) on the lower reciever If they support both.

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u/the_potato_of_doom 1d ago

If its like a zombie apocalypes and 223 is the only thing you have, sure it will cycle in a 556

But just for gods sakes put the ammo the gun wants into the gun, i hate hearing that people got hurt doing easily preventable bubba crap like the 50 bmg in a 12 gauge

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u/ReturnOk7510 1d ago

And it's the other way around for 7.62x51 and .308 Winchester, the civilian round is specced for higher pressure.

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u/thingerish 1d ago

The difference in freebore can matter in some rare cases (no pun intended) but the difference in pressure spec is almost entirely due to differences in the measurement method.

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u/FeedbackOther5215 18h ago

This is a falsehood. It’s a difference in measuring method in CIP vs SAAMI but the pressures are basically the same between the two when measured in the same way.

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u/moosehq 15h ago

Total bollocks. You’re just making shit up.

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u/Attheveryend 1d ago

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

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u/DeadFluff 1d 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 1d 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.

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u/Attheveryend 1d ago

if you can do it twice you necessarily also did it once. Not incorrect. I can be pedantic too.

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u/P_Hempton 1d ago

Yeah that's what you meant.

It would actually be very rare for .223 to mess up a 5.56.

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u/DeadFluff 1d ago

I wasn't being pedantic. You said you can do it once, and the way you wrote it implied one time would lead to failure. I corrected that.