The BM-13S, fully kitted.
Specifications
Technical Data
Weight:
BM-13S: 4.00 kg
BM-13M: 4.35 kg
BM-13MG: 4.2 kg
Length:
BM-13S, MG - 1040 mm
BM-13M - 1112 mm
Barrel Length:
BM-13S,MG - 508 mm
BM-13M - 570 mm
Cartridges:
10.57 x 72 mm Riysian - Standard
.416 Barrett
.338 Lapua Magnum
8.57 x 69 mm Riysian
7.92×57mm Mauser
7.62 x 54 mmR
7.62 x 51 mm NATO
Action: Gas-opearted, rotating bolt
Rate of Fire: 700-750 RPM (full automatic, cyclic)
Muzzle Velocity:
BM-13S,MG - 960 m/s
BM-13M - 970 m/s
Effective Range: .8 - 1.0 km
Feed System: 20 or 30 round detachable box magazine, 50 round drum
Sights: Electronics with variable zoom holographic and laser
History
The BM-12 was a highly sucessful design, remaining light, powerful, and accurate. However, proponents in the military requested an even more powerful service rifle, that would essentially push the limits of such a design. This idea, of course, was controversial, but the provision of the previously Riysian-only Stormcoat body armor suite for export - which was resistant to the 8.57 x 69mm Riysian rounds that the BM-12 fired - helped spur the development of a Riysian/Allies only rifle. As this coincided with the development of the Hunter Combat Suite, which was searching for a suitable rifle, the BM-13 recieved an electronic upgrade. The BM-13 was unveiled in December 2012, and entered service in January 2013.
Design and Operation
While the concept of the BM-012 was to provide a modern, powerful, and durable platform for Riysian ground forces, the BM-13 wanted all of the previous applied to a caliber generally reserved for anti-personel and light anti-material sniper rifles. While a challenge, much of the same technology applied to the BM-12 would work with the BM-13. To this end, much of the gun is made out of high-strength nickel-aluminum alloy and fibreglass. This lends it durability in the field and general resistance to wear and abuse, as well as making the stock a generally effective improvised melee weapon. In addition, a dust cover was installed over the bolt, to prevent dust and debris from getting into the firing mechanism and damaging or even jamming the rifle. At the same time, the composite is lightweight, increasing mobility especially in the face of the much heavier ammunition.
The BM-13 is gas-operated reloading, with a rotating bolt. As with all gas-operated self-loading rifles, part of the gas generated during the firing of a bullet is devoted to dislodging the spent casing and chambering a new round into the reciever. More specifically, a portion of the gases generated during firing operates on the gas block piston, which in turn acts on the bolt, causing it to rotate and eject the spent casing. The BM-13 differs from almost all other rifles, however. The barrel, gas tube, reciever, and bolt carrier all act as a single component group moving along an axis parallel to the bore, suspended by external stock and the handguard. This system, adapted from the innovative AN-94, and effectively utilized on the BM-12, greatly reduces the recoil experienced by the shooter, improving accuracy. The recoil force in general is delayed by this until the first rounds leave the barrel, further improving accuracy. Also adapted from the AN-94 is the conveyor mechanism - the Nikonov mechanism; in this case however loading and firing three bullets in rapid sucession instead of two on full automatic. This allows for a staggering rate of fire of nearly 2000 rounds per minute with simply the first three-round burst, cycling down to 700-750 rounds per minute. The mechanism allows for all three rounds to be firing out of the barrel before the recoil force is felt, allowing all three bullets to strike near or next to each other. This mode is particularly useful in defeating advanced body armor, with the total energy upon impact using the 10.57mm Riysian is equal or even more than that of a single 14.5 x 114 mm round. Against plate carriers and protective inserts, the BM-13 is even more effective. As such plates rely on being shattered on impact to dissipate the bullet's energy, the first bullet of the three-round stream will neutralize the plate, allowing the second bullet to either carve a way through any remaining protection thus allowing the third to impact the body, or to strike with even more damage in conjuction with the third bullet. While the recoil itself is more than the BM-12, overall, the BM-13 is still one the most accurate automatic rifle ever developed.
The defining characteristic of the BM-13 is the fully integrated use of electronics and computers. This includes a ballistics and trajectory computer, a multi-function laser, a weapons camera, and a multipurpose sight, all tied into a processor. The processor, of course, processes the data from all the different sensors and addons and feeds it straight into the sight. Inside the sight, the data from the ballistics computer generates a secondary holographic dot that allows for exact aiming at range, in addition to the main dot, allowing for greater accuracy. The weapons camera can connect directly into the Riysian Hunter Combat System or most equivalent Future Warrior programs; however, it does not connect to the sight. It can use visible light, or act as a FLIR and view with infrared light. The laser and the sight however are generously integrated, as the laser provides range and direction information to the ballistics computer and the sight. The sight is perhaps the second most important aspect of the BM-13's electronics, however. It is a variable magnification telescopic sight, allowing for 1x - 8x zoom capacity, while using a holographic dot. In addition, it can view in visible or thermal.
The BM-13 has three firing modes - full automatic, three round burst, and semi automatic. The three round burst mode is extremely effective on long distance shooting, as the modified Nikonov mechanism still operates on this setting. The muzzle brake on the BM-13 is relatively advanced, reducing weapon report and muzzle flash by a significant amount, making the BM-13 much more stealthy than its counterparts.
The BM-13 has both a top and an underslung rail system, that can mount a variety of electronic sights and equipment such as bipods or vertical grips.
The barrel of the BM-13 differs from the standard and LMG variant to the marksman variant. The standard and LMG variant have a barrel length of 508mm, while the marksman variant has a barrel length of 570mm. This, combined with the much more powerful 10.57 x 72mm Riysian, gives it a much greater muzzle velocity than the BM-12.
One noteable characteristic of the BM-13 is the ability to fire a range of rounds, although this range is noticably reduced compared to the BM-12. It can only use full-rifle cartridges, ranging from the 7.62mm NATO, to the BM-12's 8.57 x 69mm Riysian, to even the much more powerful .416 Barret and .338 Lapua, although the last two aren't recomended for use outside the marksman variant due to their powerful recoil.
There are three variants of the BM-13 - the standard (S) variant, the LMG (MG) variant, and the sniper/marksman (M) variant. The difference between these are much less than the differences between the BM-12 variants, as the 10.57mm round is at the very limit of servicable service rifle rounds. The main difference is that the MG variant has a thickened and reinforced barrel, to maintain accuracy at range when firing at full automatic for extended periods of time, and the M variant has a longer barrel for greater accuracy and muzzle velocity.
10.57 x 72 mm Riysian
The 10.57mm.
With the development of advanced body armor, more and more powerful cartridges needed to be developed. Many assault rifles moved on to the 6.5mm range, although most battle rifles remained chambered in 7.62mm or slightly heigher caliber. The Riysian 8.57 x 69mm round took battle rifle ammunition to a new level, although even by its introduction larger caliber rounds chambered for both assault and battle rifles started to make their way into the market. In addition, the Stormcoat body armor, allowed for exports in recent times, as well as other body armors providing multiple-hit resistance to .50 BMG rounds, have started to make their way into the world market. Thus, the 10.57 x 72mm round, effectively setting the limit for battle and service rifle rounds, was introduced.
Like the 8.57 x 69 mm before it, the 10.57 x 72 mm was purposely designed to defeat modern body armor, particularly Type IV/IV + armors designed to protect against AP rounds. Unlike the 8.57mm however, the 10.57mm was intended to be a round that could be just as easily turned against material or even against enemies hiding in cover. The 10.57 x 69 mm weighs 26.2 g per round, and is propelled out of the BM-13 at 960 m/s, equalling out to an energy of 12073 J. The 10.57 x 72mm retains its energy quite well, and remains supersonic way past the effective range of the BM-13. Although it would appear that the recoil would be horrendously uncontrollable when firing on full automatic, the recoil-reducing measures help to eliminate it, making the recoil not unlike that of a standard battle rifle. The 10.57 mm Riysian is available in standard and tracer, with match-grade variants available for both.
Ordering Info
Per Unit: 5,200 NSD
DPR: 12.0 million NSD.
Please order at the main storefront, located here.