T91

A 5.56 calibre selective fire service rifle designed by Combined Logistics and produced by the 205th Armory of Taiwan. T91 is a derived product of T86 rifle and as a direct successor to the previous service rifle T65. The name T91 indicates the rifle developed on the 91st year of the establishment of Republic of China, actual year of production is 2002. T91 entered service in following year of it's development completion, it completely replaced T65 rifle from the mainframe army of Taiwan and became their new standard service rifle. Other than Taiwan, other countries such as Jordan and the Emirates have also enlisted T91 to service with their Armed Forces, Indonesia can produce T91 under license. Designed based on the T65 rifle, T91 is also an AR-15 derivative that incorporates features from M16 and AR-18 rifles. Differ from most AR-15 derivatives, T91 uses short-stroke gas piston action just like it's predecessors instead of the direct impingement operation. It however uses the modernized gas piston system of T86 for an easier maintenance routine. Parts and operating mechanism within the upper receiver of T91 are also coated with nickel boride to improve firing reliability under extreme conditions. The forward assist typically found on an AR-15 derivative is also remove in T91's design. The standard variant of T91 features a chrome-lined 408mm long barrel, while the weapon itself measures 880mm with the telescopic stock fully extended, it is able to fire at a muzzle velocity of 975 m/s. The CQC carbine variant have a slower muzzle velocity due to the shorter 349mm barrel. T91 is able to achieve 800 to 850 rounds per minute of cyclic rate of fire, covering an effective firing range of 400 metres, able to fire 3-round bursts on top of semi and fully automatic firing. The weapon is fed with Taiwan made 30-round STANAG compatible magazines housing 5.56x45mm NATO cartridge. The weapon features a Picatinny rail on top of the receiver, standard issue T91 have a carrying handle that usually fits on the rail, the carrying handle also functions as the M16A2 style rear peephole sight that goes together with the frontal post. Removing the carrying handle can reveal the rail for fitting of compatible optics. Standard issue forearm arm guard is triangular in shape, it can fit the T85 40mm under-barrel grenade launcher, the launcher itself is sliding barrel break-action like the American M203. CQC carbine make use of another service arm guard since it has a shorter barrel, the other arm guard have integrated Picatinny rails on all four sides to attach modern combat equipment.