R-27

R-27
OCorp R-27 with iron sights
Type	Bullpup assault rifle
Place of origin	Yugobatania
Service history
In service	2016-present
Used by	Yugobatania
Production history
Designer	OCorp Weapons Research Division
Designed	2014
Manufacturer	O Corporations
Unit cost	$850 (avg. cost)
Produced	2015-present
No. built	Approx. >25,000
Variants	See Variants
Specifications
Weight	3.26 kg (7.2 lb) with 30 rounds
Length	27.3 in (695 mm)
Barrel length	16.3 in (414.02 mm) including flash suppresor
Cartridge	5.56×45mm OCP
Caliber	5.56 mm (.223 in)
Action	Straight blowback, closed bolt
Rate of fire	857 rounds per minute
Muzzle velocity	2,970 ft/s (910 m/s)
Effective firing range	500m (1,640 ft)
Maximum firing range	1,200m (3,937 ft)
Feed system	30-round magazine
Sights	Iron sights or various optics

The R-27, officially known as the OCorp Rifle No. 27, is a straight blowback, 5.56×45mm bullpup assault rifle, developed in Yugobatania in early 2014 by O Corporations. It replaced the various assault rifle models that were already present in the Yugobatanian inventory; this was done to help cut down production costs and to have a weapon that could fulfill the requirement for a "universal infantry weapon" to be issued to all services.

The R-27 was designed as a medium-range assault rifle, and has exceptional firing rate, being able to fire up to 857 rounds per minute. It was the first assault rifle designed by OCorp, and has become the standard service rifle since then.

Featuring a fairly compact bullpup design with fully ambidextrous controls, the R-27 is an unconventional weapon with a futuristic appearance. Its design incorporates several innovations such as its unique top-mounted magazine and its high-velocity 5.56×45mm ammunition. Additional integrated features include interchangeable visible or infrared laser and tritium light source.

History

Development

Development of the R-27 began in early 2014 by the OCorp Weapons Research Division, the main branch of OCorp focused on producing and designing firearms for the company. The R-27 itself was created to fulfill a 1985 proposal, titled Экспериментальное предложение по винтовке № 1640 (Experimental Rifle Proposal No. 1,640), by the former Federal Republic of Yugobatania, which sought to design a "...universal assault rifle that can operate in winter environments, as well as to incorporate a new bullpup-style magazine system."

In the early 1980's, bullpup weapons were a new and novel concept that were just beginning to be experimented upon in Yugobatania. After various failed projects, bullpup weapons were ultimately abandoned, and subsequently less developed upon as more conventional firearms were adopted. The proposal was rediscovered in 2014 by OCorp, and was reconsidered into production. The project was ultimately a success, and was able to incorporate more modern building techniques and conventions to improve upon the weapons original specifications.

The R-27 was deisgned built with a very high muzzle velocity, have a 30 or 35 round magazine, and to have an average weight of 6.8 to 7 pounds. It was also intended to be easy to maintain on the field, the ability interchange parts between other R-27's, and a standardised load-carrying attachment system which would allow it to be able to equip various sights and special attachments. Field tests showed that the weapon was had a maximum range of around 1,200 meters (3,937 ft), but effective firing ranges were up to 500 meters (1,640 ft). Recoil was found to be very high, meaning that bullet trajectories became inaccurate and inconsistent after its effective firing range.

Design

The R-27 assault rifle is a selective fire, straight blowback with a cyclic rate of fire of 857 RPM (rounds per minute). The weapon is chambered for OCorp's 5.56×45mm ammunition. Its unusual shape is based on extensive ergonomic research. The R-27 employs a very high level of advanced firearms technology and is made with the extensive use of polymers and aluminium components. It was designed as a Modular Weapon System, being able to be configured as a rifle, a carbine, a sniper rifle, an open-bolt squad automatic weapon, and even an experimental shotgun variant. The sniper variant is chambered in .308 OCP.

The R-27 is was developed to be fully ambidextrous—it can be operated by right or left-handed shooters with equal ease, and without making any modifications to the weapon. The charging handle, magazine release and iron sights are symmetrically distributed on both sides of the weapon, and the firing selector is located directly at the foot of the trigger, where it can be operated from either side by the shooter's trigger finger or support hand thumb. When fired, the R-27 ejects spent cartridge casings downward through a chute located behind the grip, so spent cases are kept out of the shooter's line of sight. The R-27 can be fitted with a sling for greater ease of carry, and since the weapon has a fixed stock (as opposed to having a collapsing or folding stock), it can be quickly deployed when needed. A hollow compartment inside the rear of the weapon's frame—accessed by removing the buttplate—allows for convenient storage of a cleaning kit. The R-27 was designed to be able to survive near-freezing conditions, incorporating inbuilt thermal heaters that can be switched on or off to keep the weapon free of snow and cold-temperatures that may crack the surface of the metal or possibly jam it. In order to avoid water vapor from evaporated snow that may have gotten inside the weapon, small radiator vents are located on the sides of the gun, discharging any excess vapor or heat from the thermal heaters.

The weapon's design uses the unconventional bullpup configuration, in which the action and magazine are located behind the trigger and alongside the shooter's face so that there is no wasted space in the stock, as box magazine is located directly on top of the stock. The R-27's barrel is cold hammer-forged and chrome-lined, with an overall length of 414.02 mm (16.3 in). The barrel has nine rifling grooves with a right-hand twist rate of 1:231 mm (1:9.1 in), and it is equipped with a vertically cut flash suppressor that also acts as a recoil compensator. The stated service life of the barrel is 150,000 rounds, which can be increased with proper weapon maintenance.

The R-27 uses an unique 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 R-27's fire selector provides a two-stage trigger operation, whereas pulling the trigger back slightly produces semi-automatic fire, and pulling the trigger fully to the rear produces fully automatic fire.