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.