Weapon Name- FN Five Seven
Round Type- 5.7mm x 28mm
Over-all length- 208 mm (8.2 in)
Barrel length- 122 mm (4.8 in)
Weight- 610 g (1.3 lb) empty, 744 g (1.6 lb) loaded
Rate of Fire- 600 RPM
Feed Mechanism- Detachable Box magazine
Round Capacity- 30
Effective Range- 100 meters
Range- 200 meters
Accuracy- 4 MOA
Accessories- Rails
Quick switch firing mechanism- N/A
Scope/Sights- Tritium illuminated Iron sights
Muzzle Velocity- 715 m/s
Firing System- FN Five Seven
Miscellaneous/electronic information- The weapon is essentially an FN five seven, utilizing caseless rounds, and a cobalt chrome barrel.
Basic Information
The weapon is based off of the FN Five Seven and LSAT, as it utilized caseless rounds that are approximately half the weight of ordinary, cased rounds. Heat issues related to cook offs have largely been eliminated by utilizing the correct type of binder for the propellant, which increases their heat tolerance to well over 100 degrees Celsius from ordinary propellant, even with brass cartridges. As a result cook offs are almost impossible.
The barrel utilizes a 1 in 9 inch (1 turn in 9 inches or 228.6mm) 8 groove right hand twist polygonal "flow formed" cobalt chrome barrel. the barrel is made of an alloy that contains more than 50 percent cobalt. The barrel is roughly 13% heavier than standard steel barrels, but is more erosion and corrosion-resistant and is designed to retain high strength during long-term exposure to high temperatures. Cobalt alloys are frequently used in the aerospace industry, such as the hot-gas section of turbine engines. A proof of concept M240 7.62mm x 51mm NATO barrel, in practice, had 24,000 rounds test-fired through it, causing it to reach temperatures of 1,100 degrees, without failure. A steel barrel would have failed under such treatment.
The weapon is designed to use lightweight pistol cartridges, at approximately 6 grams, half the weight of 9mm and 5.56mm rounds, allowing twice as many bullets to be carried per magazine at the same weight. The rounds are armor piercing, and have a high velocity, giving them incredible range for a pistol, with a maximum effective range of approximately 150 yards. The rounds possess 30% of the recoil of a 9mm, with a bullet that is nearly a quarter (2 grams compared to 7.5) it's size. While smaller and weaker than the 9mm, the cartidge is designed to tumble and fragment in soft tissue, enhancing it's lethality somewhat. While significantly smaller than the 9mm, .40, and .45, the round is the lightest adequately powered pistol cartridge, being half the weight of a 9mm round, and substantially less than the .40 and .45, allowing more rounds to be carried. The farther range and armor piercing capabilities allow the weapon to full-fill a wider role ordinarily not suitable for sub-machine guns, although it is still far below the capabilities of a rifle.
The weapon is made up almost entirely of plastics, composites, and polycarbonate materials, making it cheaper and lighter weight, as well as more heat and corrosion resistant than steel or other materials.
Parts of the slide, cover, and bolt are all cobalt chrome, to help deal with the increased stress and heat on the weapon. The weapon utilizes 20 round magazines, larger than the 9mm at 15, .40 at 13, or .45 at 8.
