I would highly doubt that there are many, if any at all, direct blowback .223 carbines. Like others have said, I think the H&K roller-lock design would be about as close as you're going to get to one.
When I was reading a book about the H&K MP5, they went into the history of the G3/HK91 rifle. It mentioned that if it were a straight blowback weapon, the bolt would need to be 43 lbs in order to keep the chamber closed until the pressure dropped to safe levels. I know .223 isn't a .308, but I would imagine the bolt weight would still have to be significant, probably weight prohibitive, to accomplish the same thing.
I would highly doubt that there are many, if any at all, direct blowback .223 carbines. Like others have said, I think the H&K roller-lock design would be about as close as you're going to get to one.
When I was reading a book about the H&K MP5, they went into the history of the G3/HK91 rifle. It mentioned that if it were a straight blowback weapon, the bolt would need to be 43 lbs in order to keep the chamber closed until the pressure dropped to safe levels. I know .223 isn't a .308, but I would imagine the bolt weight would still have to be significant, probably weight prohibitive, to accomplish the same thing.
Given the pressures generated by the 5.56/223 a blowback action is simply not possible.straight blowback unlocked breech guns are limited to low pressure rounds
The FAMAS is a variation on the HK system, I believe it uses a lever rather than rollers.
Still highly reliable (with good mags). Friend of mine is a now retired Legionairre with a combat tour in Afghanistan using one. He still prefers the M4, but his FAMAS didn't let him down the times it came to small-arms work.
A straight blowback 5.56mm would end up needing both hands, a foot and three friends to cycle the action. Something like a shoulder fired Schwarzlose......
Even for 9mm SMGs blowback can be a bit much, there's some heavy bolt SMGs out there.
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