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T91combat rifle, completed in 2002 and in service from 2003. Design difference vs AR-15 (DI): piston vents heat/fouling forward; DI sends gas to the carrier—trade-offs in weight, impulse, and maintenance. T91 exports/operators (reported): users beyond Taiwan include Jordan, Kuwait, UAE, Bosnia & Herzegovina, etc. (as collated in open sources). T91 Tactical / Wolf A1: Taiwan’s Armaments Bureau partnered with Wolf Performance Arms; T91 uppers and parts hit the U.S. market in 2016–2017 with strong sales and a community growing around “T91 Tactical.