Why don't modern firearms have outer threaded barrels like

>>32493326

>threaded

lol

>>32493327
Foreigner, I don't know the word for that. You know I mean those rings around the barrel

>>32493326
Modern barrels are made from better materials so heat is less of a problem.

>>32493339
Those are metal fins meant to increase surface area and help the barrel cool off.

>>32493339
nowadays we swap the barrels instead meaning you can keep firing as long as the rifle still has ammo and cold barrels

Browning M2 has a short barrel shroud that serves as a heat sink

AR15 and derivatives barrel nut and in some instances handguard serve as very effective heat sinks, especially if barrel nut is steel

M249 fires from an open bolt, helping the weapon to run cooler in general, quick change barrels as well in addition to the handguard once again serving as a heat sink

It's pretty much the case for any weapons used today that there is some sort of built in heat sink functionality, and depending on intended rates of fire/sustained fire barrels can sometimes be quickly changed in the field

TLDR because technology has progressed, dumb fucking faggot

File: 2010121311317-ctd_upper.jpg (51KB, 640x360px) Image search: [Google]

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>>32493326
Quality Rifles still do this today. They dont use a riffling but they use a diamond-shape to improve cooling.
pic related

File: 17089391245_5d53b170e3_b.jpg (191KB, 1024x768px) Image search: [Google]

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>>32493326
>>32494094
Or this AR-15 Barrel from the german high-quality manufacturer HERA-ARMS. It uses special cooling-barrel
pic related

>>32493326
Op, I think you mean ribbed for pleasure

File: MG-1M barrel.jpg (63KB, 709x300px) Image search: [Google]

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>>32493326
it's called fluted barrel, not threaded and they are still in use.Check pic for reference