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Klub Zbrane [ŽP: 24 týdnů] (kategorie Věda a Technika) moderují Al, El_Diablo, ocs, themajkl.
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Domovská stránka aktualizována 2.12.2019 04:02
Omlouvám se ale bohužel jsem musel zakázat psaní anonymům, protože nám tu nějaký sabotér vložil "hack" kvůli kterému nešlo přispívat nikomu. Nevím jestli to pomůže, ale snad nad tímto darebákem budeme mít větší kontrolu.
Srdečně zveme do tohoto klubu všechny, kteří se zajímají o zbraně, střelbu a všechno, co s tím souvisí a chtějí si o tom všem v přátelské atmosféře povídat, poradit druhým, nebo se naopak chtěji zeptat na radu.

Kdo chce vystupovat anonymně (tj. bez registrace na Lopuchu), musí si vymyslet nějaké jméno nebo přezdívku a psát ho do každého svého anonymního příspěvku.

Každého přece musíme v diskusi nějak oslovovat, aby bylo jasné, kdo na koho reaguje. Kdybychom měli odpovídat několika bezejmenným anonymům najednou, byla by diskuse značně nepřehledná. Takže, kdo neuvede jméno či přezdívku, ten jako by nebyl.

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    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 8.6.2024 23:47  34321
    Shooting Shaved Webley Revolvers (w/ Steinel Ammo)

    Steinel Ammunition has started making a rather niche new product, but one that I think is quite convenient: .45 ACP downloaded to .455 Webley pressure. This is for use in Webley revolvers that were shaved to use moon clips and .45 ACP when they were imported. This is a common modification done by importers back when proper .455 Webley ammunition was very hard to find; by converting the guns to .45 ACP they became much easier to sell (a similar thing was done with .380 ACP barrels in Husqvarna M1907 9x20 SR pistols). However, standard .45 ACP ammunition is equivalent to .455 Webley proof loads, and it's not safe to shoot it. So historically, the shaved Webley revolvers have been shootable (safely) only for handloaders. Steinel's new offering gives people a factory-made option that can be safely shot right out of the box.

    Disclaimer: Steinel sent me a box of this ammo for free. I'm doing a video because I think it's an excellent thing to have on the market, not because I can be bribed for $39.99 ;)
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 5.6.2024 22:39  34320
    Sten MkIII: A Children's Toy Company Makes SMGs



    Lines Brothers was a company in the UK that made sheet metal childrens' toys prior to the war. When production of the Sten guns began, Lines Bros was a parts subcontractor. Their engineers analyzed the design alongside the machinery the company had available and redesigned a version of the Sten that they could make very quickly and cheaply in-house, by replacing the tube receiver with a rolled and spot-welded piece of sheet steel. Their first order came in January 1942, to a whopping 500,000 guns, which were designated the MkIII.

    The Sten MkII and MkIII were produced simultaneously, and Lines Brothers was the only producer of the MkIII. Ultimately they got three contracts, although the second one was cancelled before it was completed and the third was never begun. A total of 876,794 MkIII Stens were made by September 1943. Once submachine gun production caught up with British needs, the MkII was found to be the superior of the two designs and only it remained in production.
    puschpull puschpull být nad věcí, pohoda a klid ... - AV-Com (Homepage) 5.6.2024 07:19  34319
    odložím to semDen D: Unikátní kolorované snímky vylodění v Normandii - Aktuálně.cz
    53 fotografií
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 3.6.2024 18:22  34318
    S&W M1917: A US Army revolver in .45 ACP

    When the United States entered World War One, it had a significant shortfall in military handguns. The M1911 pistol production was expanded as much as possible, but more guns were needed. Both Colt and Smith & Wesson adapted revolver designs to Army standard .45 ACP ammunition, and both were accepted into service as the M1917, despite being different guns with no interchangeable parts.

    The most interesting mechanical element of the M1917 is the development of half-moon clips to allow easy extraction of the rimless .45 cartridge. The clips were designed by S&W, but also licensed to Colt for use in their M1917 revolvers as well.

    The S&W M1917 began as Smith & Wesson's Triple Lock design, which was simplified a bit (by removing the cylinder crane lock and the barrel lug) and rechambered for .455 Webley to sell to British and Canadian forces before the US entered the war. About 75,000 were sold like this, and it was then rechamberewd again for .45 ACP for US military sales. The first US deliveries were made in October 1917, and about 163,000 were produced by the time production ended in 1919. Only about half of them actually got to the front lines by the end of the war, and many of the guns went into storage. They were actually brought back out and used in significant use in World War Two as well.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 2.6.2024 14:51  34317
    PTR Vent Suppressor: 3D Printed Titanium Foam

    PTR's new "Vent" line of suppressors are a really cool use of new technology to better execute an old design concept. The idea is that forcing muzzle gasses through a porous material will work well to slow and cool them, providing good sound suppression. Back in the 1940s (through the 60s or 70s), this was done with wire mesh rolled into a tube. Today, PTR is following the same principle to a much finer degree by using additive manufacturing to produce titanium with "purposely induced porosity". Essentially, titanium foam. Their design is furthermore done to minimize back pressure, allowing guns to run suppressed without modification and for shooters to not get a lot of noxious exhaust in the face. And on top of all that, the suppressors are quite light. What's not to like?

    Well, the price, for one thing. In addition, these cans require periodic cleaning, unlike most centerfire suppressors. PTR suggests soaking them (or better, using an ultrasonic cleaner) every 1000 rounds for pistol cartridges and every 1500 rounds for rifle cartridges. This is necessary to prevent the porous titanium from clogging up with carbon.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 1.6.2024 16:01  34316
    Romania's AK-Based SMG: the LP7 (YouTube Cut)

    In the mid 1990s, UMC Cugir began looking at ways to adapt its AKM production tooling to make a 9mm submachine gun. What would become the LP7 was first prototyped in 1998, and went into limited production in 2003, with an order of 200 made for the Romanian Interior Ministry. Romanian Gendarmes deployed with LP7s to a peacekeeping mission in Kosovo.

    Mechanically, the gun is based on a standard AKM receiver and fire control system, with a short barrel, no gas system, and a heavy simple blowback bolt telescoped over the rear end of the barrel. They use a slight modification of the old Romanian Orita SMG magazine. The stock folds to the left side, and extends to a remarkably long length. In use, the gun is quite controllable and pleasant to shoot!

    Thanks to Uzina Mecanica Cugir S.A. for giving me access to these pistols for filming, and to A.N.C.A., the Romanian national firearms collectors' association, for organizing the trip that made this video possible!
    https://www.anca.com.ro
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 1.6.2024 01:42  34315
    ПМ против Parabellum: почему в СССР не стали копировать немецкий боеприпас
    PM vs Parabellum: proč SSSR nezačal kopírovat německou munici

    Unitární pistolový náboj 9x19 mm Parabellum, vyvinutý již v roce 1902 německým konstruktérem Georgem Lugerem, se dodnes používá jako standardní náboj v zemích NATO. Ruské verze této kazety a pistolí pro ni, které se objevily v letech 1990-2000, se však nerozšířily.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 31.5.2024 14:11  34314
    Glock 46: A Revolutionary Design Change

    Except for the .22 rimfire Glock 44, all the pistols from the Austrian powerhouse Glock have shared the same fundamental mechanical system. They use the Browning tilting-barrel action, which has been long proven by many companies. With the Glock 46, however, they completely changed, and opted for a short recoil, rotating barrel design. The 46 also includes a couple other unique features for Glock, specifically intended to suit its intended role as a German police sidearm.

    In Germany, each state is responsible for selecting and procuring police weapons, but they must follow the technical standards set out by the Federal-level government. The standard Glock models do not meet these requirements, and so Glock had to develop a new model if it wanted to compete for police contracts. Most substantially, pistol disassembly must not require pulling the trigger, as this is one of the most common causes of police NDs (and this goes back at least to the Luger, which got its own police safety modification in the 1920s). The gun must also meet minimum requirements for trigger pull weigh, distance, and total force to fire.

    To meet these requirements, the Glock 46 has a longer tigger travel than other Glock models, made possible by slightly reshaping the trigger itself. It also has a novel striker disconnect in the back of the slide, which allows (and requires) the striker to be rendered completely inert for disassembly. In addition, a new disassembly lever requires the magazine to be removed before the slide can come off the gun. Put together, these features make the Glock 46 fully compliant with the Federal German police standards.

    The rotating barrel system is not required by any other these Federal standards, and it remains a bit unclear why it was chosen. The action itself is distinct from the disassembly safety system, and either one can be incorporated into a design without the other.

    Glock has thus far won one German police contract for the 46; that of Saxon-Anhalt. That agency purchased 8,600 Glock 46 pistols for their approximately 6,000 officers. It is extremely unlikely that we will see these pistol in the US, as Glock sells them only to police agencies and not to the civilian market in Europe or the US.

    Thanks to Glock for giving me access to film this pistol at their booth at EnForceTac 2024!

    Specific German police trigger pull requirements:

    First shot:
    Minimum pull weight: 30N / 6.7 lbf
    Trigger pull distance 10-15mm / 0.4-0.6 in
    Minimum value for “trigger work” (Trigger travel x trigger pull weight): 0.15J / 1.3 in-lb

    Subsequent shots:
    Minimum pull weight: 20N / 4.5 lbf for all following shots
    Minimum reset distance: 4mm / 0.16 in
    Minimum trigger travel after reset: 7mm / 0.28 in

    Requirements for unlocking the action:
    In locked systems, the trigger mechanism must be interrupted before the initiation of the unlocking takes place. The path of the moving weapon parts until the trigger mechanism is separated is allowed not be greater than 75% of the safety path.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 29.5.2024 16:09  34313
    Sten MkII: Just When You Thought It Couldn't Get Simpler

    The Sten MkI had barely been approved for production when the Sten MkII was born. Initially requested to produce a version of the gun suitable for paratroopers, in March 1941 Harold Turpin redesigned the front end of the Sten to have a quickly detachable barrel and a rotating magazine well (for compact storage). This new model was tests in late June and early July, approved for use, and contracts for it were issued in August 1941.

    Named the MkII, this model of the Sten would quickly become the standard, and it was ultimately produced by six major factories (with the assistance of hundreds of subcontractors) on three continents to the tune of 2.6 million examples made. In addition to the barrel removal, the new model has a simpler front sight, simpler stock, and a revised bolt locking notch (upward, instead of downward like on the MkI).

    Many thanks to the Royal Armouries for allowing me to film and disassemble these submachine guns! The NFC collection there - perhaps the best military small arms collection in Western Europe - is available by appointment to researchers:
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 27.5.2024 15:46  34312
    Arsenal Strike One: Russian Police Pistol Comes to the West


    The Strike One pistol originated around 2011 as a collaboration between Nicola Bandini and Dimitry Streshinskiy as a pistol to replace the Makarov in Russian police use. By 2014 is was progressing very successfully through testing and trials, and had gained some international interest, and that's when (allegedly) bribery negotiations went badly and the gun disappeared from Russian official consideration. The company behind it (Arsenal Firearms, out of Italy) pivoted to international commercial markets, and it was released in the US and Europe instead. It has since gone through several iterations and importers, and is currently being manufactured in parallel as the Arsenal Strike One in Italy and the Archon Type B in the Czech Republic.

    Mechanically, the gun is mostly interesting for its non-Browning operation system. It is a short recoil action using a vertically traveling locking block, similar to (but developed independently of) the Bergmann 1910. This action allows it to have a very low bore axis, and the fire control parts are similarly unorthodox in pursuit of that low axis. The version in the video today is a Strike One Speed, and it is indeed a flat-shooting, very nice pistol!

    Disclosure: This pistol was provided for filming by American Precision Firearms, the importer for Arsenal Italy.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 25.5.2024 00:17  34311
    AnimaceHow a Japanese Type 11 LMG Works
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 24.5.2024 23:54  34310
    3D Animation: The Very Unconventional Type 11 Machine Gun
    The Type 11 light machine gun was a machine gun used by the Imperial Japanese Army in the interwar period and during World War II. It was designed by Japanese arms designer Kijirō Nambu, based on a modification of the French Hotchkiss M1909 machine gun. It was an air-cooled, gas-operated design, using the same 6.5 by 50mm Arisaka cartridges as the Japanese Type 38 infantry rifle.

    The Russo-Japanese War of 1904–1905 had convinced the Japanese of the utility of machine guns. The Army Technical Bureau was tasked with the development of a lightweight machine gun which could be transported by an infantry squad. The resultant "Type 11 light machine gun" (named after the 11th year of the reign of Emperor Taishō) was the first light machine gun to be mass-produced in Japan and the oldest Japanese light machine gun design to see service in the Pacific War.

    A unconventional feature of the Type 11 machine gun was its detachable hopper; it could be refilled while attached and did not require removal during operation. Instead of a belt or box magazine, the Type 11 was designed to hold up to six of the same cartridge clips used on the Type 38 rifle. The five-round clips were stacked lying flat above the receiver, secured by a spring arm, and the rounds were stripped from the lowest clip one at a time, with the empty clip thrown out and the next clip automatically falling into place as the gun was fired. The system had the advantage that any squad member could supply ammunition and that the hopper could be replenished at any time. The relatively short barrel of 17.5 inches produced excessive flash with standard ammunition intended for the Type 38 rifles with barrels more than a foot longer. As a result a new load was introduced which burned faster in the Type 11's short barrel and produced less flash. This new round was called the 6.5 by 50mm Arisaka genso round.

    The disadvantage of the hopper was that the open feeder box allowed dirt to enter the gun, which could lead to malfunctions in combat. Another issue was that the weight of the rifle cartridges in the side-mounted hopper unbalanced the weapon when fully loaded. To compensate, the buttstock was designed in a way that it bent to the right, leading to the Chinese nickname "bent buttstock".

    The Type 11 came into active service in 1922, and some 29,000 were produced by the time production stopped in 1941. It was the primary Japanese light machine gun through the Manchurian Incident and in the early stages of the Second Sino-Japanese War. It remained in service through the end of World War II. It was replaced by the Type 96 light machine gun.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 24.5.2024 18:15  34309
    Cartridge History: The .451 Detonics Magnum is a Supercharged .45 ACP

    Detonics was founded as a company in the 1970s, making high-end 1911 pistols. Their first product that really put them on the map was their 3" micro-compact 1911; something that just wasn't available on a production basis at the time. After the .45 Winchester Magnum cartridge was introduced in 1979, Detonics jumped at the chance to now make a higher-power .45 cartridge that would fit the 1911 magazine. Since the .45 WinMag brass was much thicker at the base than .45 ACP, Detonics was able to cut it down to ACP length (actually one millimeter longer, to prevent it from being chambered in a standard .45 ACP chamber). They then cranked up the pressure and were able to increase velocity by 30% over the original .45 - and they called the new round .451 Detonics Magnum.

    Detonics made several different models of pistol in their new cartridge, both standalone guns, replacement slides for other frames, and package sets with both .45 and .451 barrels. They were never able to get an ammunition manufacturer on board though, and the .451 remained a hand loading proposition throughout its entire life. This crippled its chances at becoming mainstream, and it remains a very niche cartridge to this day. Its successors included the .45 Super and the .460 Rowland, which survive today but are definitely special-interest offerings.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 24.5.2024 01:49  34308
    The foldable British Barrett: Steel Core Cyclone HSR with firearms expert Jonathan Ferguson

    50.cal is a calibre that often packs a punch, especially when it belongs to a precision rifle.
    el_diablo El_Diablo Veškerá nepodstatná elektronická zařízen - mimo provoz, včetně kontroly pravopisu. 22.5.2024 17:54  34307
    Sten MkI & MkI*: The Original Plumber's Nightmare

    The Sten gun was designed by RSAF Senior Draftsman (sorry, Draughtsman) Harold Turpin in December, 1940. He sketched out a simple trigger mechanism on December 2, showed it to Major Reginald Shepherd the next day, and then finished out the rest of the submachine gun design that week. The first prototype gun was completed on January 8, 1941 and it was tested by the Small Arms School that same month. The design was approved for production (alongside the Lanchester) March 7th, 1941 and the first of 300,000 Sten MkI guns was delivered to the British military on October 21, 1941. The MkI and MkI* Stens were all manufactured by the Singer sewing machine company in Glasgow, with three contracts for 100,000 guns each issued in 1941.

    The Sten was the British response to a dire need for a large number of cheap infantry weapons, and it served that purpose well. The MkI was quickly followed by a somewhat simplified MkI*, which discarded the unnecessary flash cone and the wooden front grip. An even simpler MkII optimized for mass production followed, along with a MkIII. As the end of the war approached the MkV was introduced which had much improved handling, and it would remain in service until the 1950s, when it was finally supplanted by the Sterling.

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