Machine gun Blum

The system was developed by Misha gun Blum Nikolayevich (1907-1970) — later known developer of various samples of guns and ammunition — at the very beginning of his journey as an arms designer, in 1929. At this time, Blum served as a gunsmith in parts of the Special Far Eastern Army, but first 1930 was aimed at the disposal of the Head of the Red Army Ordnance Department for the implementation of their own inventions.

The problem of automatic special reference to learning machine-gun was then very exciting ones. Guns were considered the foundation of infantry firepower, "skeleton" of its combat formations. Growth in the number of heavy machine guns "Maxim" in the entry of the Red Army, and adopted a new light machine gun Degtyarev DP raised the issue of the preparation of high-quality mass-gunner. This could not be achieved without the often held shooting live rounds at targets. But in the criteria Saver similar rate of live ammunition was very undesirable, even more so with all this resource is consumed and combat weapons, supplies of which are still insufficient.

It is no accident one of the articles in the journal "Military Gazette" (1927) called the "Machine Gun saving mode", and the teacher of the course "The Shot" VV Glazatov in the same year wrote in "Small arms and tactical collection", which is widely resorted to practical gunnery Heavies live ammunition "can not afford not only our own, yet cost-fledgling country, but even economically wealthy bourgeois states." On the other hand, is not far away at all parts could create a shooting range to the size of ensuring the necessary security by firing from automatic weapons. Comparable to a cheap and low-power small-bore cartridge was a good solution to these problems.

At that time, small-caliber gun under 5.6 mm rimfire cartridges — original or remade from combat (for securing the best skill) — is widely used for training of personnel in almost all armies. Now a small-caliber pistols, revolvers and rifles added a small-bore gun training. But in its development to be solved a number of problems in the supply of automation systems and allowing for the rimfire cartridge (or, as it states "side fire"), having sustained an instrument in small sizes.

Errant pressure generated in the barrel during firing 5.6-mm rimfire cartridge, forced to choose on the basis of automatic recoil free slide. Trigger gun school was acting on a back-battle spring, a shot made on the rear sear. Initially planned for firing small-bore gun mounted inside the machine gun "Maxim", had to greatly reduce the size of the receiver and the stroke length of the gate. This gave rise to superfluous highest rate of fire — up to 3000 rounds / min, so we had to enter the moderator rate, reduces it to a 450-800 rounds / min. Again, as for reducing the size of the store with a limited mobile rack capacity of 25 rounds.

But after the industrial tests of the "gun-liner" was abandoned in favor of a compact machine guns were mounted on the outside "Maxim". Accordingly, the increased size of the receiver, it is possible to ensure the rate of fire of 600 rounds / min (similar to the rate of fire of heavy machine "Maxim") unless the moderator, who was expelled from the construction.

Original power system has been solved. Learning gun, fastened on the outside of combat, allowed the use of higher-capacity store and maintain fire longish queue.

Blum machine gun drum magazine included a cartridge disc in a circular box and drives the rotation of the spring. The circumference of the disc had 40 isolated nests in which to insert the cartridges (for safety appeal filled only 39 nests). After descending shutter moving forward, would pick up the cartridge from the slot located in front of the breech of the barrel, and shall be sent cartridge in the chamber. Two of the striker, aggressively set out in front of the gate to strike the primer composition to the lip liner, came a shot. When moving the bolt back under the impact cartridge cases stretched from the trunk, and again took place in the nest. Following the departure gate far enough disk cartridge turned, putting the barrel in front of the nest with another patron. If the slope remains depressed, the shutter under its own spring went ahead again and the cycle is repeated automation.

Due to shot "with rollout shutter" and great length bolt recoil automatic machine gun work differed smooth — hitting the shutter in the front and rear positions were malooschutimy. "Direct" supply cartridge reduces the load on it and increased the reliability of the system. When attaching the machine gun on top of a machine gun "Maxim" drum magazine was located on the right.

For the first training rooms DP machine gun, tank or aircraft YES DT was used the same gun Blum, who was attached to mount certain parts exterior resemblance to a suitable prototype. So, for the training of hand gunners ("machine-gun-degtyarevtsev" as they are sometimes called to distinguish it from the "maksimistov", ie calculations of heavy machine guns) to strengthen gun wood stock, scope, perforated barrel shroud, bipod. Drum magazine for all that was located below the gun. With a simulated machine gun was mounted DT iron butt machine gun YES — rear control stick.

Of course, small-bore cartridge could not simulate the impact of its own actions rifle and machine-gun fellow, but he allowed to practice techniques aimed fire in the criteria for the limited shooting. Maximum range bullets from a machine gun Blum did not exceed 1000 m For comparison: the machine-gun "Maxim" it was 5000 m, the machine-gun DP — 3800 m 7.62-mm bullet cartridge retains its lethal effect up to 2500 m, range of slaughter act 5.6-mm bullet cartridge more than an order of magnitude smaller.

Produced training machine guns, of course, at the least, if combat. For example, in 1933, Highland Tool Factory number 2 (now plant them. Degtyareva VA) issued a 33 gun Blum in 1934 — 1150, in 1935 — 1515.

BASIC Properties machine gun Blum

Caliber 5,6 mm
Cartridge 22 LR (5,6-mm "long rifle")
Body weight machine gun without magazine 3.3 kg
Weight 1.1 kg store
Length 946 mm gun
Barrel length 645 mm gun (a version of "rifle gun" 400 mm)
Rate of fire 600 rounds / min
Shop detachable drum
Magazine capacity 39 rounds

Small-bore gun Blum has played a role in the improvement of firearms training of personnel in the 30s, and was used in a limited system of non-military training. After Lofty Russian war machine guns to such types are not vorachivalis. In the 50's, when a lot of an old military weapons handed in hunting, made an attempt to reincarnate in a hunting gun and preserved small-caliber machine guns. Supplied with the machine gun and wood lodge diopter (ring) sight. With the help of such "rifle gun" held a trial for shooting wolves from aircraft (there was such a campaign against wolves), but that experience cause and stop there.

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