STK-54

The STK-54 (From Fefsen: Siinrak Tionsal, Kinel 1954, 'Assault Rifle, Type 1954') is a Mirhaimian assault rifle developed by Mirhaimian small arms designer Kilian Mainne Domman nar Giker'ha, and manufactured by Reingiker Armory. It was the standard issued rifle of the Mirhaime Realm Defence Forces from 1954 to 1995 with variants and derivatives still serving within other Mirhaimian uniformed services till this day.

The STK-54 was designed in 1952 by Reingiker Armory at the request of the Mirhaimian Realm Guards to replace the semi-automatic TK-38. The weapon was heavily influenced by contemporary designs, in particular its long stroke piston gas system. Several prototypes were made, and the rifle passed trials in late 1953; proceeding to full manufacturing by 1954. From 1954 to 1987, approximately 1,820,000 rifles (of all variants) were manufactured, and put into service with the Mirhaimian Realm Defence Forces.

In 1955, a derivative of the rifle, the STK-54SA passed Sarvian military and was put into service with the Worker's Armed Forces under the designation of Rk-55A. Approximately 300,000 Rk-55As were manufactured under license by Defense Interprise "Kommunardi" for use by the Sarvian military.

The rifle also saw success within the Mirhaimian civilian sector under the commercial name of M55. According to the Bureau of Firearms, Swords, and Explosive Control (BFSEC), approximately 2,132,000 M55-platform weapons were registered, and in circulation as of 2022; 442,000 of which are fully automatic.