How Open Bolt Actions Work In Firearms

This is the site I downloaded World of Guns: store.steampowe...
You can check out the website of the developer of World of Guns at this link: noble-empire.com

[@TheMouseGunner]

If you are wondering what program I use for the creation of this video, please check the description. It should be included on every video in this series, if not let me know.

[@aidenpearce7900]

Why does the bolt have those grooves? The Sten gun has those grooves on the left side of the bolt, why have that on the bolt?

[@edralinpusag8535]

@@aidenpearce7900 the extractor slide on it and the 2 other is for not to touch the magazine leaf

[@pushfast6175]

hi how can i covert my .22 gevarm into [e-mail]..thanks pal

[@asdasd-be5ww]

Holy shit man. I did not expect to find a so detailed and informative video about this on youtube. God job, keep it up.

[@angrymaninapandamask6432]

I normally find videos like this on pornhub

[@johnnyappleseed5753]

Detailed, well narrated, nice job. 10/10

[@AntonDense]

I second that brother.

[@martyhartyarty6745]

These videos are a gold mine of information. Very in depth while remaining simplistic. Everything is very explained well with great visuals for easy and further understanding. Amazing job Mousegunner! Thanks for making these.

[@rafaellastracom6411]

One thing. On the MG42 trigger group the sear disconnector plays an important role specific to this design. Normally you do not need such a device on a strictly automatic firearm as a simple trigger connected to a sear is sufficient to stop the bolt. The MG42 however has two issues that make for the need of this particular disconnector. The issue arises from the heavy bolt traveling at high speed that must be stopped by a sear that is relatively long and thin. Because it is an automatic only weapon when you release the trigger the bolt can find itself at any point on it´s travel. If it finds itself right behind the sear as it comes back up to catch it the bulk of the bolt energy could be caught by only a few thousands of an inch sear engagement. Couple this tiny contact patch with the high bolt speed and energy and you can end up with shearing of the long sear and/or its deformation, which is naturally not acceptable. Enter the MG42 disconnector. This specific disconnector design ensures that after the trigger is released the sear will only be allowed to reset itself with the rearward motion of the bolt. As such, the sear will never be reset with the bolt moving forward for the above mentioned reason, rather it resets with the bolt moving backwards and only backwards. This ensures the sear has enough time to reach its hardstop as it requires less time to do so than the bolt which has to continue moving backwards through the override region and rebound off the buffer. By the time the bolt reaches the catch position the sear is in the fully home position, therefore exposing maximum area on the sear surface to stop the bolt safely. Without this disconnector on this particular sear design the bolt will slowly but surely shear the sear edge during use. It is an interesting design detail particular to the MG42.

[@klaud7311]

When i worked in Arms Gallery in Copenhagen, i was always taught to remember; Closed bolt = fires and loads, open bolt = loads and fires.

[@klaud7311]

I would actually like to take credit for that statement myself, since this was never something I was taught. Yes, I worked in Arms Gallery, but I came up with that myself. I have a bad habit of giving credit to others because I'm afraid of not being taken seriously.

[@practicalintuition4030]

@@klaud7311 what is wrong with you? Lol

[@eliasdeleone7059]

Way to be hombre, highly specialized and detailed information, created and uploaded for the benefit and convenience for all of us thank you!

[@AnonOmmus]

Very informative, thank you. I got to fire a BAR once when I was a kid and always wondered how that wonderful weapon operated. Seriously, thanks.

[@johnfredette7420]

Thank you so much for taking the time to explain everything in detail! Most X-ray videos only play the animation which makes it difficult to understand what's happening.

[@commanderosis435]

Just found your channel. Great work sir. I can tell you are a true enthusiast and student of the art of firearms.

[@m.7n6]

As easy as it gets, you can manufacture an open bolt smg with regular supplies and parts from a AutoZone, hardware store, and home Depot, Lowe's, salveyard car parts

[@8MADJACK]

Great video, while I agree that most open and a few closed bolt actions don't lock open on the last round, it has nothing to do with the action type and everything to do with weather a bolt hold open is incorporated into the system, the one open bolt that has this is a thompson SMG, pretty unique, advanced for it's time, and useful for speeding up reloads. AKs and HKs don't lock open are good examples of closed bolts that don't lock open on the last round.

[@glaringeagle742]

Thanks for your super informative videos, they are endlessly entertaining for those of us who are mechanically enthused.

[@BruceWayne-to1vp]

Wow! Bravo! The detail and the depth of explanation is second to none. Thank you for taking the time to make these videos and make them so thourough.

[@dfwai7589]

I'm gonna be that guy, this concept is incredibly simple and did not need a 45 minute long video to explain.

[@BangBangBo]

This is honestly one of the greatest gun video explanations I have ever seen... THANK YOU SO MUCH.. I cannot wait to watch your other videos.. I feel like I just found my new Netflix series hahaha

[@mikunan]

Thanks for the extremely thorough covering of these fascinating mechanisms, wow.

[@wendellbshepherd]

Great video. One question: How does the slow/fast fire rate selector work on the BAR?

[@Sauron191]

Do find all this fascinating!! … Few little sloped & cammed edges etc, all seems very simple but absolutely ingenious!! AND this can happen up to and over a 1000 times per minute, 15-20 cycles per second!! …

[@smorrow]

The BAR's "fires from open bolt, but it's linear-hammer-fired" system would possibly be amenable to firing from the closed bolt in semi, like the FG-42 which is an odd duck itself (and whose fire-control is just like an open-bolt weapon).

[@HenriFaust]

Your channel has the best explanations.

[@mwnciboo]

Single Shot/Semi automatic in British Military Parlance is "Repetition" hence R and Automatic is simply A. Same to this day on the L85A2. STEN is crude and Simple, UZI is elegant and well thought through.

[@Htown-vd3gy]

You are one of the best YTers for educating people on the workings of firearms! Taking the time to develop such detailed models that show the events adds so much educational value. Thanks and keep up the great work!

[@elcaponeholyemperorofnj1169]

I’m really enjoying these videos

[@commentingisawasteoftime7195]

2:10 and I finally know why it's called an open bolt. Does anyone else have any similar engineering channel suggestions that aren't all guns?

[@alejandro3241]

One of the best videos I have seen in a long time :) Cheers

[@parkerthefloridian817]

TBH I don't have a problem with auto/semi auto switches. If you need to take out multiple targets the semi will become handy. But if you are cover firing for someone (if you have a high cap mag with this gun and a way to cool the gun down) the automatic is going to be useful

[@thor-dx8sz]

a couple days age I find an open bolt semi-automatic uzi in a gun shop😊it's so cool

[@basssorc]

It has been ten years since I last fired an MG3 when I was in the army. Do I remember correctly that you could only feed the ammo-belt if the bolt was back in the cocked position?

[@JohnDoe-dj3xh]

I mean, it's pretty easy to convert most semi only variants... maybe not that easy. But yeah, it's also illegal to own any machinegun made after 1986(without ffl and sot). And to make them. And to not pay a 200 dollar tax and submit to an ATF investigation and CLEO approval to buy one. And pay the 20000-50000 dollars one costs. So "regulate" means "make prohibitive".

[@ringsidejudge4302]

A really explanative video.I have been wondering for years just how the Sten changed from single shot to fully automatic and this video tells me clearly..Most youtube videos seem to skip this particular area of operation leaving a bit of a grey cloud hanging over. Could you please explain how the cartridge does not fire when the bolt head comes in contact with it prior to entering the breech? Thanks again for five star detail it is appreciated.

[@Prometheus7272]

Bit late but essentially the bolt only fully transfers momentum into the round until the round cannot travel any further, which stops the bolt, transferring its momentum. Think about how getting hit in the hand with a hammer hurts more if you lay it out on a table then if it hits your hand with nothing behind it. Force is the change of somethings momentum. So when the bolt stops it transfers force into whatever stopped it.

[@ringsidejudge4302]

@@Prometheus7272 Thank you . The hammer on the table explanation is a brilliant way of explaining it . Now I know . The bullet is always moving away from the bolt until it stops in the chamber and then detonation occurs . Thanks again .

[@Prometheus7272]

@@ringsidejudge4302 Not a problem, surprised you replied after 3 years :D

[@ringsidejudge4302]

@@Prometheus7272 No one can accuse you of acting too fast lol , I appreciated the explanation .

[@sinkhole40]

Thorough, and very well done.

[@fastslick3039]

Best pictorials I have ever seen, New subscriber,

[@BusinessWolf1]

I'm trying to design a gun and sell the blueprint for 10% of all it's sales but I'm still wrapping my head around the cocking and firing mechanism

[@TheMouseGunner]

What you would want to get royalties off of is a patent not a blueprint. If you have an idea that you want to pursue, I highly recommend researching patents and how to file them. For a patent you don't need to showcase every element of a design only the relevant novel element that you are trying to patent. If your idea doesn't qualify as novel then it isn't patentable and I am sorry to say no one is likely to be willing to pay you for anything. Not to be discouraging or anything but I would do a lot of research before committing to this endeavor, as a lot of elements of firearm design has already been designed, coming up with something that is novel will be tough. Also, I suggest not telling me or anyone else about it until you have a strong understanding of patent law or the advice of someone that does.

[@ericlujan3149]

MouseGunner what exactly is the distinction between recoil operated locked breech and delayed blowback?

[@BusinessWolf1]

MouseGunner Very Helpful.

[@natedavis8942]

Really like your gun vids! Would the length of the barrel on a 9mm blow back effect the gun performance in any way??

[@TheMouseGunner]

Yes, longer barrels are beneficial in most instances of firearm design. How beneficial is mostly dependent on the ammunition itself. Basically the longer the barrel is the more time it spends accelerating due to the force exerted by the expanding gasses of the burning propellant. Some cartridges benefit more by the length of the barrel then others, due to burn rates of different powder types and so on. There is a point of diminishing returns though, where the force exerted by the expanding gasses starts being balanced out by the friction of the barrel on the projectile, but in general terms a longer barrel is usually a good thing in any firearm design.

[@natedavis8942]

Thank you!! I am gathering a bunch a research on open bolt blow back guns and your vids have helped me get an understanding of how they work. I am trying to make a 9mm open bolt blow back, more or less along the lines of a Sten. :)

[@muha0644]

45:45 now you can use a process called "Electro-chamical Machining" (ECM) to rifle a barrel using only electricity

[@jesterglb9527]

Your videos are amazing!!!! I was curious as to what a blowback system was. You far exceeded my expectations for an answer. Thank you for the excellent presentation. I will be subscribing to this channel for future reference material 👍👍👍

[@ariefardiansyah4804]

i get new enlightenment because of this video , thanks

[@jstarr7506]

Excellent work my dude! 👍

[@Revon-Feuer]

the fact that they tried to ban these, the thought of it, i want to burst out in laughter.

[@sammylacks4937]

Thanks for explaining. I imagine head space has to be very tight to get fixed pin to fully strike primer. Does this cause a problem with various brands of ammo or cases with shoulders not in spec?

[@BigShay1977]

Very well done and great explanations!

[@milojohnson3057]

subbed, great vid

[@jeanmichelpassepartout4438]

Milo Johnson me too first vid I see I like and sub

[@cfnaround1585]

If it was blank fire only. You can go full auto from open bolt

[@ringsidejudge4302]

Sorry just watched video again and have seen that edge groove of bolt peels off round and not the face of the bolt. Does the barrel face have a concave bevel to assist round on entering breech ?

[@Hassan_MM.]

Awesome! Can we say the difference at the sight of it?

[@dutuzeremy5544]

Great work.

[@asifmostafa1939]

@MouseGunner Plz make one video on STK 40 mm Automatic Grenade Launcher Mark-2.

[@jackstephens7222]

Its amazing to learn how thinfs like this work

[@youneszreika]

World of guns app finally finding a good use educational stuff , am I right mate ?

[@markbenn1907]

Great video. One question. Do you know what that little cut away on the side of the bolt is? It's on bottom of the bolt on the magazine side. THANKS!

[@rodlrfilmmakercreator1460]

I like your computer program, how the weapon work. I use Sketchup. Any advise to use it on my sketup?

[@shantisadan8888]

Most I formative video amongst all

[@ariefardiansyah4804]

nice vid, very educated...

[@brianzhao1763]

Arief Ardiansyah you know his program is gun dissasembly on his PC right

[@ariefardiansyah4804]

yes i know , i played it too , but still dont understand until he explain the work openbolt

[@mrmoralman1]

I can't believe there are so few views for this vid! good work man! (altho maybe a bit too long?)

[@Bananana4320]

What is the open bolt for?

[@MarkAAshdown]

Fantastic - thank you very much

[@subterfusion4005]

great video.. may i request the Ingram Mac 10 and PPs43. Thanks so much for the video!

[@J24NY]

Awesome video, I learned a lot. Thank you.

[@olivierdols5556]

so simple....i love it

[@bengriffith5963]

Thanks so much for this video, it was awesome.

[@theepicmaxgod9648]

Doesn't that mean that open bolt weapons will degrade faster, due to the spring constantly under pressure.

[@phucgiang395]

Not really. Closed bolt spring also has pressure. And if you're not firing an open bolt you can left the bolt in the forward position.

[@therandommemecat7738]

Now I know how Milano 821 works

[@TheMinemastersMc]

If someone really wanted to convert a closed bolt gun into full auto, couldn't they fix the firing pin forward like an open bolt gun? I understand that you wouldn't be able to stop it from firing, but if you REALLY wanted to do it, would it work? Or would it fire out of battery?

[@gsxrgeorge00]

I know with the sks, if you dont keep the pin clean and loose. It can do a mag dump on accident.

[@KJTUSKJTUS]

I know this was 3 years ago but in short, yes it's possible. Let's use an AR for example. If you fix the pin in place the charge handle or bolt release would essentially be your "trigger" and in the same aspect you should essentially be able to use the bolt hold to stop it from shooting. Now on a gun like an AK with no bolt hold, same concept, you charging the gun will fire it and it won't stop until you either get light primer strike or run out of ammo

[@taxpayingamerican993]

I'm confused as to how the gun stops firing when you let the trigger go in full-auto if the sear bar is off to one side. Does the sear bar reset until the trigger is pulled again?

[@MansMan42069]

The sear returns to its normal position when the trigger is released. The sear has its own return spring.

[@mrod7692]

That was incredible!!!

[@thangamajig]

I guess the extractor pushes the round and prevents firing during the chambering or a round??

[@PothocketsFPV]

The firing pin simply doesnt have enough momentum behind it to strike the anvil until the weight of the bolt can come down on it when it gets chambered.

[@KrisMercure]

Awesome video

[@AAronDaOper8r]

As yes. But how do bullpup open boot actions work???

[@shadowbanned-9577]

Keep this.. And, Perhaps... break it up into a series.

[@MultiSoftE]

very well done

[@emanuelgoncalvessantos4499]

Damn, BAR is really complex...

[@alexoelkers2723]

Does a open bolt system need a extractor or are gases enough to eject the round?

[@TheMouseGunner]

In some operating/action systems, in particular straight blowback systems like the uzi or the sten, it is not required, as you said the recoil energy of the gases will do the job, but the extractor does help with smoother more reliable extraction.

[@MrRustynail3006]

MouseGunner have you done a video on the browning a5 if not please do one. thanks for your work awesome job

[@frantisekvohnik2816]

Why does Sten have double feed magazine??

[@benquinney2]

I like closed bolt

[@crazywyvern4704]

What type of gun is that first gun?

[@smorrow]

Sten gun

[@carlblaskowitz7817]

Next up.... Internal gimbal mounted seeker head for AIM-9 air to air missile, exploded diagram and fields of regard.

[@helihoot]

What do you think about the AA-12 Semi coming out?

[@TheRoadhammer379]

All have been seized by ATF

[@mq5731]

So how does the bolt get push back after firing round?

[@AJ-ij4cq]

Recoil.

[@smorrow]

The operating system. If the gun is 'X-operated', that means X cycles the action.

[@user-oy9zy4ds9m]

Too bad you can't make a open bolt gun anymore even in semi auto only form they're considered illegal machineguns in the US :/

[@jacobbaker726]

Challenge Accepted. ;)

[@dannybrown4817]

Do all open bolt weapons use fixed firing pin?

[@smorrow]

No.

[@smorrow]

But all open-bolt weapons do have a firing pin whose movement is a function of the bolt's movement, and nothing else. Usually this means the firing pin is levered forwards at the front of the bolt's travel, although on the M134 Minigun it's more like screwed forwards.

[@josecordova4602]

muy bueno

[@Mancave_sheep]

Oh wow thx

[@TheWaggishAmerican]

Repeal the Hughes Amendment and NFA and defund the ATF yesterday, please. I need a sten.

[@metasequoia3097]

Fixed fire pin, interesting.

[@ninoamaro]

Good😆

[@baileymiller1056]

Thx

[@RobbySk8erBoi]

imo semi auto is the way to go. full auto is just for shiggles

[@sebster3gmail]

Wow. Tx

[@stevenpham1961]

Is there a pro to closed bolt?

[@atomik7066]

Spring is not always under pressure

[@smorrow]

Accuracy. 47:00

[@elidennison9902]

in other words... why the ATF sucks...

[@xbillups8322]

Repeal NFA and Hughes Amendment, they are simply cancer.

[@zacharyherrington8829]

I hate browning all of his guns are over complicated they jam constantly without proper maintenance

[@IOIIOHilmiHikmatulloh]

Make a video about barrel twist please

[@gewishworm4724]

I didn't know youtube allowed porn on its site

[@hamerhove]

That intro sucked being too loud and too present, but the rest was very informative.

[@joetitterington1222]

too many said's and not enough said explanations

[@espake122]

TOOB

[@Muddybagclean]

Jesus Loves You

[@ATINKERER]

Could you be more long winded and speak like you're talking to a 5 year old?