How does a submachine gun work, exactly?
Or just, any kind of weapon capable of full auto fire that isn't gas-fed like an assault rifle?
Genuine question, i'm really ignorant about guns and i figured i should just ask you guys about it.
How does a submachine gun work, exactly?
Henry Foster
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Nicholas Martinez
It varies by gun to gun. Like a Mac 10 operates on an open bolt system while the gun you posted works on a roller delayed blowback.
John Wood
the bullet has its primer struck, which causes it to ignite the propellant, sending the bullet flying out
as the gas expands and pushes the bullet, it also pushes a piston which removes the now empty casing and pulls the firing pin back to its original position
the next round then goes into the chamber taking the place of the spent round and the process can start over again
Gavin Morris
So it's mostly springs, right?
What pushes the bolt back after the first ignition?
Matthew Stewart
It depends on the gun itself. Most machineguns use a direct blowback system, meaning that the recoil force from the gunpowder directly sends the bolt backwards thanks to Newton's third law. This has a comparatively high perceived recoil compared to other systems but it's as simple as it gets.
The mp5 has a roller delayed system like the G3 IIRC.
Xavier Watson
Blowback, in the case of the MP5 you posted, roller delayed blowback. You pull the trigger, gun goes bang. The force with which it goes bang sends the bullet zoomin' and, as the name of the system implies, blows the bolt back, far enough that it chambers another round on its way back to the chamber. Now, in this system the firerate is regulated by how heavy the bolt is, meaning if you want a slower more controllable firerate you need a heavier bolt which in turn makes a heavier gun. Roller delayed was invented so theres no need for a heavier bolt, instead the firerate is regulated by that to fire another shot two little rollers need to be in their place, which slows down the firerate without increasing the weight of the gun much
Connor Smith
Generally sub-machine guns were used to issue to soldiers who needed a weapon that packs more punch than a pistol, but doesn't take up the space of a full size service rifle. Due to design and manufacturing limitations from the times, it was the most economic and logistically sound to make these short weapons into rapid fire pistol caliber carbines.
The Submachine gun however became obsolete as modern infantry armors started easily defeating the pistol rounds and modern manufacturing caught up with the introduction of carbines like the M4 and the AK74u.
SMGs however still have a role in most counter terror/police uses due to their easier handling and reduction of collateral damage when doing Hostage Rescues/Raids.
Any modern Sub machine guns in service are either reserve gear or reclassified as Personal Defense Weapons for specific crew who require something with a bit more firepower than a sidearm, but cannot even have something as long as a carbine on duty with them.
Owen Moore
Isn't that just how an assault rifle works?
Thanks anons, you explained it perfectly.
David Rogers
The bolt is reset by a big spring, which also keeps it in battery.
youtu.be
Aaron Smith
Godtier video, thank you user.
Jace Nguyen
m.youtube.com
Watch this one. It's the best "how do guns work" vid ever made.
Colton Jackson
A gun could be roller-delayed and fire from an open position, mind.
More than just fire rate.
With blowback, the action stays closed/doesn't open up enough, until the rearward push of the cartridge overcomes the weight of the bolt.
With a roller-delayed blowback setup (or lever-delayed), there's a mechanical function to delay this, meaning the bolt doesn't have to be as heavy.
It's important that your action doesn't open too early, both to make sure the bullet goes down the bore, and to make sure chamber pressure is low enough that it's safe to extract the case (if you do it too early, the case can stick in the chamber, and fail to extract, an extractor could potentially just tear the rim or back end of the cartridge from the rest of the case).
In the case of H&K's roller-delayed designs, the action does actually open really early, and it has a design feature to make sure extraction goes like it should; a series of lateral grooves are cut in the chamber (called fluting), which allows gas from the from firing to seep back, and in a manner of speaking 'lubricates' the casing, so that it can be extracted reliably at this early stage, without sticking.
There's a misconception that the fluting damages the casing, but this is not true, the speed of the action ejecting causes this, the casing bouncing violently just behind the ejection port immediately after it ejects (leaving brass marks on that spot). If one wants to save brass, there exist buffers to prevent this and cushion the case's impact.
The fluting does however allow gas to seep back into the receiver, and after a shooting session, an MP5 or G3 can end up pretty dirty inside (but they handle it).
William Howard
>Godtier video
What else would you expect from Gun Jesus?
Dylan Ward
Bump
Henry Stewart
the fluted chamber also helps to protect you from brass jews by marking your cases
Asher Anderson
>submachine gun
The key point is that they are meant to be fired underwater.
Ethan Baker
the open bolt designs are probably the easiest to understand
Xavier Flores
Think of the action spring, bolt, and chambered cartridge as a long stroke piston. The expanding gas that propels the bullet forward is also acting on the case. The projectile achieves maximum acceleration at the muzzle, thereby overcoming the mass of the bolt and displacing it rearward (Newton's Third Law)
Jeremiah Thomas
This, look up Bernoulli’s law. The diameter of the cylinder that the gas is going through on an AR is about 6mm and then looking at the gas tube that experts enough pressure to push back the Bolt carrier group against a strong spring.
Though that is true, my point is that this question’s answer depends on what action or what gun we are talking about. I should have specified open vs closed bolt, but alas I’m here
Cameron Johnson
small correction... and why DI is ingenious, the gas tube for an AR only pressurizes the inside of the BCG and doesnt push it back. The pressure inside the BCG causes the bolt to unlock and the bolt pushes back the BCG nice and evenly against the chamber, thus avoiding carrier tilt.
Oliver Ramirez
Like assault rifles, it uses a small electric motor to fire in full auto mode. Semi auto uses a gas cartridge.