#roller delayed blowback

[gun-gallery]

PTR 91 - 7.62x51mm

[i-identify-guns-in-posts]

Hey same autism! Love the blog, what's your favorite Rifle platform? I like the G36 series.

Well to stay in HK I love their roller delayed blowback guns. G3, HK33, HK21, MP5, all of them.

[married-to-a-redhead]

Firearm Friday! Pictured is the CZ 52 from my collection. Developed in the early 1950s in Czechoslovakia, this semi-automatic pistol introduced the use of a roller-locked delayed blowback system, which was unique and improved the accuracy of the firearm. The vz.52 also incorporated the 7.62x25mm Tokarev cartridge, known for its high velocity and penetrating power. Don’t dry fire this pistol because the firing pins are a weak spot and will need replacement if the gun is dry fired too often.

[kineticpenguin]

whats wrong with direct blowback?

It's stone age technology that is dirt cheap and simple to make reliable guns with, but that comes with some tradeoffs, and the biggest among them being felt recoil. Your typical 9mm AR direct blowback carbine will be bouncing around more than a 5.56 AR of the same size using the standard DI system.

In theory that's fine if the gun is cheap; there are plenty of 9mm direct blowback PCCs that are on the market well under $800, especially used. But there's this rising trend of making more direct blowback guns for well in excess of that. Noveske and B&T are probably the most egregious examples, charging well over $3000 for direct blowback 9mms. For that kind of money you can get an H&K SP5, you get a roller-delayed blowback action, and often have some money left over despite also having the bonus of being able to LARP as the SAS.

The thing that gets me is that despite everybody and their mother trying to rush 9mm PCCs out onto the market these days, is that so many of them are charging a lot of money for unimpressive guns with cheap actions. As far as I'm aware, Sig Sauer and CMMG are the only companies offering something new and functional without using direct blowback, in the form of the MPX and Banshee respectively. And the MPX is kinda stupidly expensive, but it's still typically $1000 less than a Space Invader or APC9.

[nickigunshops]

The MP5 SD 9mm: A Legacy of Precision and Innovation

The MP5 SD 9mm, a derivative of the renowned Heckler & Koch MP5 submachine gun, stands as a testament to German engineering excellence in the realm of firearms. Since its introduction in the 1970s, the MP5 SD has garnered a reputation for its precision, reliability, and innovative design, making it a favored choice among military, law enforcement, and security professionals around the world.

The mp5 sd 9mm is distinguished by its integrated suppressor system, which sets it apart from its predecessor, the standard MP5. The “SD” in its name stands for “Schalldämpfer,” which translates to “silencer” in German. This feature allows the MP5 SD to operate with significantly reduced noise and muzzle flash, enhancing the operator’s stealth capabilities. The integrated suppressor, combined with subsonic ammunition, minimizes the noise of firing, making it ideal for covert operations where stealth is crucial.

Design-wise, the MP5 SD retains many of the characteristics that have made the MP5 iconic. It is chambered for the 9mm Parabellum cartridge, a widely used round known for its effective balance of power and controllability. The firearm features a roller-delayed blowback operating system, which provides a smooth and reliable cycling of the action. This system reduces recoil and improves accuracy, making the MP5 SD highly effective in close-quarters combat situations.

The MP5 SD’s build quality is a hallmark of Heckler & Koch's commitment to durability and precision. Constructed from high-grade steel and polymer, the submachine gun is designed to withstand harsh conditions while maintaining its operational integrity. The firearm’s design includes an adjustable rear sight and a fixed front sight, allowing for quick target acquisition and enhanced accuracy.

One of the standout features of the MP5 SD is its versatility. The submachine gun is equipped with a retractable stock, which provides the user with the option to adjust the firearm’s length for improved maneuverability. This feature is particularly advantageous in confined spaces where a shorter weapon profile is beneficial. Additionally, the MP5 SD can be fitted with various attachments, such as tactical lights and laser sights, to further enhance its functionality.

Throughout its service life, the MP5 SD has been adopted by numerous military and law enforcement agencies globally. Its use by special forces units and counter-terrorism teams underscores its effectiveness in high-stakes environments. The firearm's combination of accuracy, reliability, and reduced noise output makes it a valuable tool for operations requiring a balance of firepower and discretion.

Despite its storied history, the MP5 SD is not without its limitations. The submachine gun’s range is relatively limited compared to rifles chambered in more powerful calibers, and its reliance on 9mm ammunition means it may not be suitable for all combat scenarios. However, for missions where close-quarters accuracy and stealth are paramount, the MP5 SD remains an exemplary choice.

In conclusion, the CMMG Banshee 9mm embodies a legacy of precision and innovation that has solidified its place in the annals of firearm history. Its integrated suppressor, reliable operating system, and versatile design make it a standout choice for those in need of a high-performance submachine gun. As technology and tactics evolve, the MP5 SD continues to be a symbol of engineering prowess and a testament to the enduring appeal of well-crafted firearms.

[attackcopterblog]

MILITARY ARMAMENT CORPORATION ANNOUNCES MAC 5 AND MAC 5K ROLL OUT

Military Armament Corporation has announced the release of the roller-delayed blowback MAC 5 and MAC 5K models. Military Armament Corp states “Military Armament Corp (MAC) is pleased to announce that the MAC-5 and MAC-5K are now shipping. The MAC-5 and MAC-5K is MAC’s version of one of the most iconic firearms of the modern era. Leveraging decades of expertise and incorporating modern tooling…

[jamesthecomiccreator]

The Arkinghamverse Collection! (3)

"Throughout history, certain Groups of Interest (GOIs) in Arkingham have been equipped with specially made firearms to address their unique needs and enhance their effectiveness in various operations.

Most modern firearm trials, such as the U.S. Army's Modular Handgun System and the Special Operations Forces Combat Assault Rifle (SCAR) trials demonstrate the continuous evolution of weaponry to meet specialized needs; these trials often result in the production of custom firearms with enhanced features like improved accuracy, durability, and adaptability.

By understanding the specific requirements of each group, companies like Arkingham Family Ltd. Co. have played a crucial role in equipping individuals with the tools they need to perform their duties efficiently and safely, thus contributing to the overall security and stability of this nation."

- An Official Statement from NATACOM, Nations Against Terrorism and Ananomalies Coalition, Operations and Management, 2024

G.O.I - "Wall Street Ghost Accountant" / ARK-WSGA: A 46-round, .460 magnum, pistol-caliber carbine designed after the Thompson SMG designed with heavily modernized furniture to reduce weight, improved ergonomics for comfortable shooting, compatibility with standard 30-round magazines, and rails for attachments; while it could be argued that the use of a magnum PCC is impractical, the people behind the Arkingham G.O.Is don't care, it's bullet hose time!

G.O.I - "The Untainted, Punchy Assault Carbine" / ARK-Puncher: A 30-round, select-fire, assault carbine rifle designed after the ARK-Spitter's original design by Alexander D. Drew; while it retains some of the old features from the former model such as the roller-delayed blowback, folding stock, ergonomics and high-quality finish, it also features new modifications for modern combat such as rails for customization, varying barrel lengths, improved sights, and improved parts for almost no recoil while shooting in full-auto.

[safarpublishing02]

The G3 Rifle: A Legacy of Reliability and Adaptability

The G3 rifle, originally designed by the German arms manufacturer Heckler & Koch (H&K), has earned a reputation as a robust and reliable battle rifle since its introduction in the late 1950s. Its development was heavily influenced by the wartime experiences of World War II and the technological advancements of the post-war era.

Development and Design

The g3 rifle traces its origins to the Spanish CETME rifle, developed in the 1950s by a team led by the German engineer Ludwig Vorgrimler. The CETME rifle was based on the German StG 45(M), which itself was derived from earlier Mauser designs. When H&K acquired the manufacturing rights to the CETME design, they refined it further to create what became known as the G3.

The G3 is notable for its roller-delayed blowback operating system, which enhances reliability and reduces recoil. This system allows for effective use of the powerful 7.62x51mm NATO cartridge, making the G3 suitable for long-range engagements and providing superior penetration capabilities compared to contemporary assault rifles firing smaller cartridges.

Features and Performance

Design Features:

The G3 is a selective-fire rifle, capable of semi-automatic and fully automatic fire modes.

It features a stamped steel receiver and a robust synthetic stock, which contributes to its durability and relatively lightweight design.

The rifle's simple and effective iron sights are adjustable for range and windage.

Performance:

Known for its accuracy and reliability in various environmental conditions, the G3 gained popularity among military and law enforcement agencies worldwide.

Its long-range capabilities and stopping power make it effective in combat scenarios where engagement distances are extended.

Global Influence and Legacy

The G3 rifle quickly became popular internationally, adopted by numerous armed forces across the globe. It saw service with NATO countries, as well as with armies in Asia, Africa, and Latin America. Its robust construction and adaptability to different operational environments ensured its longevity well into the late 20th century and beyond.

Variants and Derivatives

Over the decades, the G3 platform has evolved into several variants and derivatives, catering to specific military and civilian needs. Variants include different barrel lengths, stock configurations, and even chamberings in different calibers to suit various operational requirements.

Conclusion

The G3 rifle remains a testament to German engineering and the evolution of battle rifles in the mid-20th century. Its legacy as a reliable, powerful, and adaptable firearm continues to influence firearm design and development to this day.

[breathofmyown]

There's just something very compelling to me about roller delayed blowback. Like any engineering decision it of course had trade-offs, there's certainly reasons it hasn't come to wide spread use. There's just something about it I find very sexy though. Perhaps it's related to the Cold War styling of many weapons it's used in which I've always been particularly drawn to aesthetically.

[zenithfirearms]

What Are the Parts in an MP5 Bolt Carrier Group?

The bolt carrier group of an HK MP5, which is the heart of the action’s infamous roller-delayed blowback operation, comes apart in a couple of pieces.

The bolt group houses these pieces, which are responsible for feeding, locking the action, firing, extracting, and ejecting spent casings. Here’s what the main components are.

The MP5 Bolt Carrier Group Itself The MP5 bolt carrier group is a metal component that carries the bolt body and also communicates with the recoil rod and spring, storing energy to return and reset the acton after firing the gun.

The bolt carrier group also contains rails that serve as an interface between the group and the MP5’s receiver. The bolt carrier group should be kept clean and well-lubed to ensure fluid operation, minimal friction and wear, and to protect against corrosion.

MP5 Bolt with Rollers, Extractor, Ejector, and Springs One of the main components of the bolt carrier group itself is the MP5 bolt, a roughly cylindrical, small metal piece that contains the extractors, ejectors, springs, rollers, and which houses the locking piece with the MP5 firing pin within it.

The bolt is a cylindrical metal body that contains a hollow for the locking piece, which helps control the rollers, as well as contain the firing pin.

The rollers, which protrude from the sides of the bolt body, fit into recesses in the barrel trunnion, providing a delay after the cartridge is fired before they disengage and allow the bolt carrier group to move rearward.

The bolt itself also contains the extractor, ejector, and associated springs which extract and eject spent cartridges.

The Locking Piece The MP5 locking piece is a small metal component that houses the firing pin and which fits into the bolt body.

Basically, the locking piece is a timing piece that “tells” the bolt how long the rollers should remain locked in the barrel trunnion before allowing them to roll back and cycle the action.

The MP5 Firing Pin and Spring Inside the MP5 locking piece is the MP5 firing pin itself, a small metal cylinder with a pointed head, driven by a spring. This is the component that actually strikes the base of the 9mm cartridge, igniting the primer.

The firing pin itself must be properly heat-treated in order to prevent deformation at the tip which will compromise primer ignition. Ideally, it should also be treated with a corrosion-resistant finish to protect it.

Zenith Firearms: High-Quality, USA-Made MP5 Parts Looking for high-quality MP5 parts to make repairs, upgrades, or replacements to a German HK MP5?

Visit Zenith Firearms. They carry a wide range of MP5 parts and accessories, designed for their American-made MP5, the ZF-5, but which are compatible with Heckler & Koch MP5, MP5K, and SP5K platforms, along with other 9mm roller-delayed blowback firearms such as MP5 clones.

Their MP5 parts are made with high-quality steel, heat-treated, and many of them are finished with wear and corrosion-resistant manganese phosphate coatings to improve durability and longevity.

Moreover, they make a wide range of USA-made parts, which helps ensure 922(r) part compliance.

For more information, visit their website via the link above or get in touch with them at Info@ZenithFirearms.com.

[freekw]

Lc smith collectors

The lightness of the projectile meant it had a lower recoil impulse, which was a key objective of the engineers as it would reduce bullet dispersion during fully automatic fire. The bullet reportedly behaved like a standard full metal jacket bullet. In addition, sources state that at 1000 metres, the projectile could perforate Spanish, Russian, Italian, Czech and German helmets. Sources from the time indicate that at 1000 metres, the dispersion characteristics of the bullet were equal to those of normal rifle projectiles despite its light weight. While such a lightweight bullet would normally be affected by crosswinds compared to a normal weight projectile, the engineers at CETME contended that the bullet's aerodynamic shape minimised this problem. The solution was that the aluminium core was wrapped around the middle in a copper jacket that was open at both ends, leaving the exposed aluminium core at either end (the core's middle section was compressed to allow the copper jacket to fit without protruding). To allow such a long projectile to be stable in flight, a method was required to achieve proper mass distribution. The rounds weighed 6.8 grams and had a muzzle velocity of 800 m/s. It would be lightweight and elongated to make it aerodynamic, yet fired at normal rifle velocities. Thus the 7.92x41mm CETME, CA-001 cartridge was developed and unveiled in 1953. This required a very ambitious development of rifle technology to work but the CETME engineers, based on earlier German experiments, believed this was possible by using an unconventional projectile. The requirements for the original design requested the rifle weigh no more than 4.1 kg, an effective range of 1000 metres and a large magazine capacity.

The horizontal marking left on spent cartridge cases has become a signature of this design. That is a fluted chamber, which is horizontal grooves in the chamber, that allows the cartridge cases to float on a layer of gas to aid extraction. However, the CETME Model 58 introduced a novel solution to the problem of cartridges sticking in the chamber. The CETME design inherits the StG45(M)'s fixed-barrel. The MG42 locking system actually locks completely and requires a short-stroke barrel that travels backward to unlock, compared to the StG45(M) system that never completely locks and does not require a moving barrel. The StG45 used a roller-delayed blowback mechanism somewhat similar to the roller-locking system patented by Edward Stecke in the 1930s in Poland and used in the MG 42. The CETME (Centro de Estudios Técnicos de Materiales Especiales) rifle was designed primarily by the German engineer Ludwig Vorgrimler, who based his design on the experimental German StG 45(M) and the French-made AME 49. Semi-automatic variants were also produced for the civilian market. The CETME 58 would become the foundation of the widely deployed German Heckler & Koch G3 battle rifle. The Model 58 used a 20-round box magazine and was chambered for the 7.62×51mm NATO round (although originally designed for the 7.92x51mm CETME cartridge and later for the reduced power Spanish 7.62×51mm cartridge). The CETME Model 58 is a stamped-steel, select-fire battle rifle produced by the Spanish armaments manufacturer Centro de Estudios Técnicos de Materiales Especiales (CETME). Centro de Estudios Técnicos de Materiales Especiales (CETME)

[historicalfirearms]

CETME L vs HK G41

In this week’s Armourer’s Bench video I compare two of the last roller-delayed production rifles: the Spanish CETME Modelo L and the Heckler & Koch G41. These rifles represent the last evolutions of two strands of the roller-delayed development tree - the Spanish and the German.

The rifles while both being chambered in 5.56x45mm and both using roller-delayed blowback actions differ a great deal in both their designs and their features. Not only are their external appearances very different but their internals also differ a great deal. In one of those fascinating quirks of fate, however, both of these rifles were eventually replaced by the HK G36. 

Check out the full accompanying article for more info and photos over on the TAB website, here.

[i-identify-guns-in-posts]

What do you think of the venerable G3?

I love roller delayed blowback and i had a dream i owned a G3SG1

[tronmike82]

I just thought up a version of the M3 grease gun that’s roller-delayed blowback instead of straight blowback, and I started thinking of more changes to it; only to realize I have essentially dreamed up a rip-off of the Sterling gun.

[adamjagger]

The grand power stribog is a Slovakian 9mm carbine style pistol. Imported by global ordnance out of Sarasota Florida. The stribog sp9a1 gen 2 is normally priced between 700-900 depending on where you get it and what kind of sales are available at the time. The example I have shipped with 3 magazines, 2 straight body magazines and 1 curved magazine. Mine also came with the sb tactical brace that most firearms of this style come with. As a little bonus the Stribogs come with a spare set of the polymer flip up sights and it all ships in a pretty nice hard case.

Out of the box it is a lot smaller than I had expected. (That’s what she said) It has a solid weight of 5lbs 1oz unloaded on the 8” barrel model. There is now a 5” barrel model available along with models that accept Glock magazines. There are 3 main models of stribog to look for, the original is the sp9a1 which a direct blow back with a reciprocating charging handle. Shortly after that came the sp9a1 gen 2 which is also a direct blowback model but with a non reciprocating charging handle. Which to me is a major plus. Then that leads us to the sp9a3 which is grand powers take on a roller delayed action. I am honestly not super knowledgeable or experienced with the sp9a3 considering I’ve never even seen one in person. All of the models ship with lower receivers that have fixed non changeable grips and take the proprietary stribog magazine. As long as I’m understanding this correctly, the neat thing is that the serialized part is the upper receiver portion. Therefore you could easily change out the lower to one of the many aftermarket options available that better suits you.

First shots- The first time I took the stribog out I was not exactly thrill with how it went. I had two failure to feeds in the first magazine. Then when I removed the magazine to clear the malfunctions the entire magazine shot the remaining rounds out. After two or three more times of picking about 28 rounds out of the snow I realized that the straight body magazines that they ship with these are absolute junk. The curved magazine that they send however is awesome. The curved magazines look better, seem to be made better, and have ran 100% flawlessly.

So after the initial hiccup the first time shooting it I have really grown to love this firearm. Since owning it I have added a couple small upgrades from HB industries to it including their short stroke buffer kit and their mini comp thread protector. I have since put a couple thousand rounds through it with nothing but good times and good things to say about it.

Grand Power has since released the 5” barrel models and the models that accept Glock magazines. Aftermarket support for the stribog seems to be pretty good with offerings from companies like HB industries, Jtac industries, and Arms republic. There are plenty of parts available online like handguard extensions, lower receivers that take different magazines, triggers, and grips.

I think the future is bright for the little stribog and I am excited to see what comes next for it. In the future I may try to get ahold of a sp9a3 to check out. In the meantime if you are interested in picking up a stribog for yourself then I would highly recommend it. That being said make sure you pick up a few curved magazines that way you can avoid the entire first situation I had.

Awesome firearm for the price, and I’m sure you’ll love it.

Happy shooting!

Adam Jagger gun blog post #1 7/10/2022

[coffeeandspentbrass]

What's your opinion of the cz 52?

They’re neat! Don’t see a lot of roller delayed blowback pistols