The T91 (Chinese: 聯勤5.56公釐T91戰鬥步槍) is a gas-operated, magazine-fed, assault rifle produced by the 205th Armory of National Defense in Republic of China (aka Taiwan). It is based on the proven T86 assault rifle, incorporating features from the M16 and AR-18 with more modern features. The T91 is lighter and shorter than the T65 it replaces, and has a 3-position telescoping stock to allow adjustment based on individual requirements.