T91 assault rifle

The T91 (Type 91) assault rifle is produced by the 205th Armory, Ministry of Defense, Republic of China. It is based on the proven T86 assault rifle while incorporating features from the M16, AR18, HK G36, and other well-known foreign firearms. T91 is lighter and shorter than the T65 it replaces and has a 6-position telescopic stock to allow adjustment based on individual requirements. 

T91 was a further development of the T86 assault rifle which had been intended to replace the T65 assault rifle series in ROC military service. Experience on the previous design and feedback from various users were incorporated into the T91. Development was completed in 2002, and volume production commenced in 2003. 

In 2003, the ROC Army ordered 101,162 T91 combat rifles as force-wide replacements of all service rifles, with a delivery schedule from 2004 to 2008. Export sales of the T91 to Jordan and Kuwait have been officially confirmed. Over 140,000 rifles have been produced.

Country Name Origin Year
Taiwan 2002
Country Name Operational Year Retirement Year
Taiwan View

T91 is a gas-operated short-stroke, air-cooled, rotating bolt, magazine- or drum-fed, select-fire, modularized military rifle compatible with various tactical accessories. Similar to its predecessor, T91 is a shorter version of the T65K2 assault rifle, giving the operator higher mobility and ease of aiming in confined space.

T91 has a 4-position selector switch: S – safe, 1 – semi-automatic, 3 – three-round burst, and A – automatic. Like the T65K2, T91 utilizes an M16A2-style front post, rear peephole sight. The rear sight, mounted on the detachable handle, is adjustable for windage and elevation. Operation of the charging handle, magazine release, and bolt release are the same as the M16. One notable difference is that the T91 does not have a forward assist, and the brass deflector is not as pronounced.

The action of the T91 is based on the T65 series. However, parts are not interchangeable because the bolt lug on the T91 is shorter by 1 mm. T91 also inherits the modularized gas piston system from the T86, allowing easy removal for maintenance without the risk of losing small parts.

The telescopic stock on the T91 was designed based on the experience of military and police personnel with the M4 Carbine. The resulting product has improved recoil transfer and handling qualities. A rubber recoil pad is also added for comfort. The handguards are triangular in shape

T91 has a 407 mm (16.0 in) barrel with flash suppressor. Rate of rifling twist is 178 mm (7.0 in). Due to the use of a shorter barrel, the T91 has 20% more recoil than the T65K2. Average group size at 175 m (191.4 yd) also increased by 10 mm (0.39 in). The chamber and bore are chrome-lined and can fire 5.56×45mm NATO ammunition. Standard-issue 30-round magazines for the T91 feature indicator holes for the top 2-15 rounds as well as two protrusions on each side to avoid over-insertion. However, standard STANAG magazines may also be used.

Type Assault rifle
Place of origin Taiwan (Republic of China)
Service history
In service 2003-present
Used by Taiwan
Bosnia and Herzegovina
United Arab Emirates
Production history
Designed 2002
Manufacturer 205th Armory
Produced 2003-present
Number built 140,000+
Weight 3.17 kg
Length 880 mm (stock extended)
800 mm (stock retracted)
Barrel length 406 mm
Cartridge 5.56×45mm NATO
Action Gas-operated, rotating bolt
Rate of fire 800-850 rpm
Muzzle velocity 975 m/s
Effective firing range 600 m
Feed system Various STANAG Magazines.
Sights M16A2-style sights with windage and elevation adjustments
Picatinny railing can be used for mounting various optical sights

End notes