Comments by "The Immortal" (@theimmortal4718) on "How the M4 Evolved and Could Stay in Service till 2040" video.
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@musikSkool
The 5.56 is plenty lethal for infantry combat.
There's no place on the human body that, if hit from a more powerful round like a 308, would be deadly but not with 5.56.
A hit to the head, heart, spine, liver, kidneys, would be a fatal wound with 5.56 as much as any other round. It's light, deadly out 500 meters, and relatively inexpensive. It's easy to carry 300-400 rounds, too. Most soldiers aren't firing all that far, and having a lot of rounds is more important than more energy or long range performance.
I predict that a hybrid steel/brass 5.56 with 80,000 PSI will be forthcoming soon from SIG. That would be enough pressure to push a 77 grain 5.56 round at 3000 fps from a 16" barrel.
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@scoutdynamics3272
That's not true at all.
Where is a hit on the body lethal with a bigger round, but not lethal with 5.56?
You still haven't answered that. Modern 5.56 fragments in the body and penetrates deeply out to 350 meters. It punches right through cars, level 3 body armor, and engine blocks.
A soldier with a magnified optic has no problem engaging targets at 500 meters.
Any place a bigger round would kill, so would 5.56.
Soldiers use carbines for personal defense weapons while operating other systems, for close quarter fighting, and cover fire while maneuvering. The main weapons in a platoon are the GPMGs, Javelins, drones, and Gustav's. Having a long range rifle round isn't that important for rifles, and neither is barrier penetration. That's what the AT weapons and machine guns are for.
What most troops need is folding stocked, 12 inch barreied 5.56 with a suppressor, folding stock, a clear 1-6 day optic with the ability to add a clip on thermal. Maybe a quick change barrel for marksmen to add an 18" barrel in minutes. Make the carbine and ammo under 15 pounds with 210 rounds.
Most guys will be carrying MG ammo, 84mm ammo, and AT/AA missiles. A heavier carbine round just adds weight with little benefit. I'd rather be able to get 20" 5.56 performance from a 12" barrel and have a light weapon.
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