M90

==Design==
The M90 is a selective fire, straight blowback-operated weapon with a cyclic rate of fire of 900 RPM (rounds per minute). The weapon is chambered for Rubicon's 5.7x28mm ammunition. Its unusual shape is based on extensive ergonomic research. The weapon is grasped by means of a thumbhole in the frame that acts as a pistol grip, as well as an oversized trigger guard that acts as a foregrip for the shooter's support hand. The P90 fires from a closed bolt for maximum accuracy, and its design makes extensive use of polymers for reduced weight and cost. Overall, the weapon is lightweight, weighing 2 kilograms with a full magazine.
The M90 requires minimal maintenance, and it can be disassembled quickly and easily. It is a modular firearm, consisting of four main component groups: the barrel and optical sight group, the moving parts group, the frame and trigger group, and the hammer group. The P90's barrel is cold hammer-forged and chrome-lined, with an overall length of 263 mm (10.4 in). The barrel has eight rifling grooves with a right-hand twist rate of 1:231 mm (1:9.1 in), and it is equipped with a diagonally cut flash suppressor that also acts as a recoil compensator. The stated service life of the barrel is 230,000 rounds.
The M90 uses an internal hammer striking mechanism and a trigger mechanism with a three-position rotary dial fire control selector, located at the foot of the trigger. The dial has three settings: S – safe, 1 – semi-automatic fire, and A – fully automatic fire. When set on A, the P90's fire selector provides a two-stage trigger operation similar to that of the Mannlicher GR-3 assault rifle pulling the trigger back slightly produces semi-automatic fire, and pulling the trigger fully to the rear produces fully automatic fire.
===Specifications===
*Length: 505mm
*Caliber: 5.7x28mm
*Effective Range: 200-300~ Meters
*Weight: 6.6 Pounds (Fully Loaded)