Delayed Blowback System in Firearms 

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.

Thank you for helping us understand and unlock some of the secrets behind this kraut space magic.

We were using AG3's in the army and they didn't even teach us how they work. Now I actually understand what the rollers are for. Thanks! PS I would definitely subscribe for more firearms theory/design videos

WoG is probably the most underrated programs out there. What a blessing for the DIYer and developer.

I always wanted to fully understand my Hk 91 and this video really helped. Thank you. There was a bit more to it than I was thought

I came here with no knowledge and left with a complete understanding of the systems described. Thanks for taking the time to explain what u clearly have a great understanding of.

Thank you, this has to be the best visual and technical explanation for the mechanics of these systems

I learned something! Thank you! Facinating to umagine the development of these designs (and other complex machines) befor the days of CAD. Brilliant minds.

This is the coolest explanation + graphical presentation!

I experienced the eureka effect for how the roller delayed system works at 6:27 and it was probably the best feeling I've had to experience thus far in my life. I just have to put this out there sorry ;)

I just stumbled upon your video. Great work man ! U did it in a very intuitive way. Keep up the good vids !

i tell way this beats the ever loving shit outta those vids where they just play the animation and slow it down and zoom in barely at all. thanks man!

Thank you for the in-depth look. There were some very specific things I wanted to understand

Great series on firearm operations.

holy crap. it took this animation and your explaination at 6:39 to understand how it delayed the blow back. Thank you so much as it perplexed me for a while.

Excellent video, I also totally agree with the comments made by Vincent Yossarian were most people do not know how firearms work and worse off they don't seem to care. Thanks

Wow! Amazing video! Fantastic job!

I love the HK roller system, I don't know how I stumbled across your video now but it would have come in handy before I first field stripped my Ptr91 GI. I had stripped it all down to the bolt and trigger assemblies and put it back from memory lol luckily its a pretty simple enough system to understand

i hate how you have to grind on this game (World of Guns: Gun Disassembly) just to get most of the guns you really do want. such a pain.

Very informative video. Thanks for posting.

I'm a visual learner and needed this video lmao. I was watching another guy's video on roller delayed systems and was like 🤔😧🤯 thanks for the knowledge 🤙

Awesome video!!

Great explanation of the roller delayed blowback system. I am now educated

Thanks this is an excellent explanation

MouseGunner, THANK YOU for the very, very excellent and detailed explanation of the various operating systems! I really can't believe there's only 2 other comments on this, and so few views, I guess not that many people really care how things work, as long as they work. I am always horrified by how many of my friends who have been driving for decades have no clue how internal combustion works, or disc brakes, or the simplest appliance... I find it troubling, and frankly, a little depressing. Anyway, I have just watched this first video of yours, but as soon as I'm done writing this comment (and sending the link to all of my firearms-enthusiast friends!), I''m going to watch ALL of your other videos. I am actually a student of design/engineering, and have been designing military-style rifles and pistols as a hobby for some years, while concurrently learning AutoCAD to model the designs... Not saying I will ever be building any of them, but it is a very fun and rewarding pursuit, and you never know; I might come up with a design on my own, or through collaboration, that merits some prototyping! In the meantime, your video(s) are thoroughly enjoyable and fantastically helpful resources. Please, keep up the good work!

What a well done video, wow, thank you

These videos are the best I have ever seen. THANK YOU! Have you ever done one on a full auto trigger system?

That was a fascinating presentation of a blow back system or any system using technology to view the inside workings. I'll look into the links you provide. Thanks so much.

great video, thanks!

Great video

I had to do a tad bit of research in this when I beefed up my Sig 1911 to fire .45 Super. I needed a stiffer recoil spring, flat bottom firing pin stop, and stiffer main spring. All this to delay the opening of the slide to allow pressures to drop.

Just wanted to thank you for these videos. I've built 50+ firearms and am very familiar with most of the topics you've covered but still find myself learning new things. Also seeing the x-ray helps to better understand the functionality. Great job!

That "...little bit of time that it takes for those rollers...", of the H&Ks is 1/16". Nice video!

Real good man. Thank you.

Great video. Thanks.

8:19 lol have you tried cocking a G3? you gotta muscle the first few cm of the cocking handle to get it going

@ 5:22 you refer to the cutouts for the rollers as being part of the "receiver" that is actually still inside of the "Bolt Carrier Group." other than that i thank you for going over it in a youtube video so i didnt have to download something or figure out blown parts schematics =)

What program you used for this animation

at the beginning you mentioned the case making a case seal. then why do all these delayed roller bolts have fluted chambers?

So is the general principle of this type of system to add inertia to the initial stage of the blowback cycle that is then overcome to allow a lower inertia bolt to finish the cycle? So that would mean the action isn't held closed or locked at the start of the cycle it's just got more resistance as if it were a really heavy straight blowback bolt?

Hello, what program do you use to do this? Thanks very much

Excellent explanation with technical details regarding engineering. Laymen, enjoy this video because with it you will begin to understand the physics of weapons. ANGRY!

what website or software did you use to see all different internal parts of the weapon?

Thanks for the inspiration.

So the px4 storm is like a rotating barrel delayed blowback?

I also realise your not using an AR15 as an example and my CMMg radial delayed blowback system is such. So I think the last part i need for the build is some kind of plug for the open gas port in the upper?Just not sure if there is such an animal or if i have ot buy yet a 3rd upper in my quest for the perfect one? hehe HELP???

This is the first time I've seen your channel. Definitely excellent explanation and animation. What software did you use? This definitely doesn't look like solidworks and I love this

Good job man love u from India Punjab Amritsar

Great video Rick Moranis.

Shhhh!! Working on a new type of Fixed Barrel/Compound Recoil design for (Target) Pistols. Its not like any other semi-auto feed and extraction system I've seen. I Got the idea in 1991 and still to this day no one has developed anything close (I have researched 130 years of semi-auto designs and patents to make sure). I'm retired now, so i have time to start working on the blueprints and building a working prototype.

Much thanks for the in-detail explanation on how delayed blowback works. I was wondering how roller delayed blowback worked on the G3 family (of which our lovely MP5 is derived from, along with the PSG-1 and HK21 and their variants) worked. I'm likely to re-watch it a good number of times to drill into my head how it works.

Okay, so what starts the movement back of the bolt on the MP5? We got two parts, the bolt face, and the bolt (with wedge), and the bolt-wedge starts moving back before the bolt face? What's pushing the bolt-and-wedge back before the bolt face? Cuz the blowback is coming from the cartridge case, which should be pushing against the bolt face, right?

I'm still wondering about how the bolt carrier moves inward first while the bolt head haven't been pushed yet. is there like another gas tube that leads them to push the carrier? or is it just a mistake on the animation part?

I did stop the vieo in the 1st 2mins because i realize this is an older vieeo and i dont know if the Radial Delayed Blowback system was even created as of then by CMMG? I recently purchased a Barrel/BG combo of the CMMG radial delayed blowback system and paired it with a dedicated Range609 lower receiver and Angstadt Arms dedicated AR-9mm/45ACP/40cal upper. The one without a forward assist and larger ejection port. Im not sure if i will like it though only because i cant put on a port cover and its got an open gas port for a gas system....so far i havnt found any plugs for upper with gas ports for the CMMG radial delayed blowback system since theres no longer the need for a gas system. I dont want the gunsmith to have to weld or plug the port with lead? I want to be able to use the upper later if ever needed for another rifle that may not have a delayed blowback system? So i may have to purchase one of CMMG's upper that are made for their radial delayed system? Only because im thinking they would make them without a hold there?lol idk not an armorer or gunsmith and pretty green even after 9yrs in the hobby late in life! I got addicted immediately! My 1st was the typical 38Spcl for home protection and the 1st time i shot it i went out and purchased several other handguns and long guns within a few months! That 38 will always have a place in my heart and will never sell it and it will always remain in my night stand next to the bed. Nobody but my wife and i now so no bull about locking it up! lol finally got her to go to the range with me once after 7yrs in the hobby and she loved it but has a condition that is aggravated by the pressures produced even by a .22LR round going off indoors. Living in the bluest state in the country means we have one handgun range any where near us so she cant shoot with me anymore. Not 30mins into her 1st time shooting and she started talking about buying her self her own .33LR pistol or revolver? LOL But thanks to our blue state there are restrictions for everything. We cant take handguns or 22LR long guns to any public ranges as they must be more dangerous. And only recently were we Subjects of the empire were given permission to shoot our sporting rifles at said public ranges. In any case im building this new .45ACP carbine with high end parts and making it a one of a kind to make it even more special for me! I love the AR configuration and family of firearms as anyone can get into building them while watching a youtube video or 10!!!LOL Thanks so much for your video it was cool!

7:15 Finally got it. the system is kinda like a side release buckle

Thank You

Question - is the blowback system a bad idea for a rifle like the FAMAS?

so am i understanding that the action is similar to a neuton's cradle somehow the case rearward impulse passes through the bolt head then the back half starts moving back and grabs the front half unlocking and extracting?

Are there barrel-blowback SMGs ?

I've read some comments but I still don't understand how the first part can start moving if the case is completely still. Is the case deforming and creates a bulge that pushes the firing pin?

u made my day

What causes the markings on the casing after its been ejected from a roller blow back system?

it's just like a direct blowback that they use for the scorpion evo

is this an available program or you custom modeled all these yourself ?

So glad I found this video 😂

Thank U!

4:35 What is causing the rollers to move back if the cartridge is locked in place at the time of firing?

The price difference between having delayed blowback or straight blowback is ridiculous. How many fgc9s can you build for the price of 1 mp5?

what is the software？

Awesome!!!!!

So, the first part is kinda like a gas operated, but with rollers, right?

can you do rotating bolt operation, like a m14 or grand action??

I literally was just using this game, got curious what delayed blowback actually means, and the video I find is using the same game to explain it 😂

2:36 he’s trying to show the delay but the computer is showing the piston moving through same speed basically.

The G3 looks just like this on the inside as well.

The rollers should be moving in simultaneously as the locking piece starts to move rearward, not after it starts moving. Their inward movement is what drives it rearward. Also the bolt head does start to move very slightly to the rear as the rollers compress inwards, its just too slow to expose the thin cartridge case walls before the bullet exits the barrel and pressures drop to safe levels.

what causes the 'wedge' to move?

One can easily understand the mechanism of roller delayed blowback design with the following. commons.wikimedia.org/wiki/File:Delayed_blow_back_breech_with_locking_rollers.jpg commons.wikimedia.org/wiki/File:Delayed_blow_back_breech_with_locking_rollers_(en).svg The World of Guns game software is a game software not designed for what you were trying to do. Also keep in mind that as soon as the bullet starts to move forward in the barrel, the whole bolt assembly starts to move rearward. The delay is measured in the microseconds. (meaning bolt assembly is already moving rearward, while the bullet is still in the barrel)

Anyone care to explain why the G3 is very prone to getting carbon built up? Is it because the blowback gas often flows to the action and thus leaving residue or something?

sounds like the dude that does those funny videos where he makes suasages out of weird things and tries it

Can you do a video on AN-95?

Wat abt Kriss Vector

The Germans used rollers in ww2 on the MG42 to speed up the cyclic rate. I'm not 100% certain but I think that was the first gun the design was used in?

I'm sorry I'm kinda new to all this stuff but is this the same as Gas Operated System.

Why does the mp5 have delay rollers?

I've used a real MP5. Low recoil ad smooth shooter. Good 3D model and explanation 👍

These rollers press in *HAAAARRRRD!!!*

It's called magic secret revealed.

Hk rifles use fluted chambers that aid in case extraction. Your model does not illustrate this.

Why aren't blowback systems the preferred systems instead of gas systems?

when he said HARRRRRRRD at 1:07, i got scared

The rollers don't necessarily start moving inward immediately as the wedge retracts. They have no force pushing them inward applied to them until the bolt head begins coming back as well, dragging them against the trunion, which then pushes them in.

Good video...condense it though.

I don't see the merit of this design. A locked breech system would actually be simpler, wouldn't it? Can anyone explain this?

Well, dude, you need to show what's squeezing and such

6:04, 6:22 i should see a therapist ==))

This is why I dislike delayed blowback. They have a problem with brass cases.

The rollers are not "sucked" in. The rollers are pushed in. The Swiss did this best.

You have no idea how this system works and it shows.

I dont have to buy to play an animation in the app . all gun in the RU-vid.