Firearms historians have separated AR-10 production under the A.I. license into at least three basic identifiable versions, along with various sporting, carbine, and other experimental designs and calibers. The three main variants have been termed the "Sudanese" model, the "Transitional", and the "Portuguese" model AR-10. A.I. built all of these rifles, beginning with the Sudanese model AR-10. The Sudanese version derives its name from the sale of approximately 2,500 AR-10 rifles of to the government of Sudan in 1958. The Sudanese model was equipped with a very lightweight, fluted steel barrel fitted with a trim, prong-style flash suppressor, a bayonet lug, lightweight fiberglass furniture, and sight graduations in Arabic. The Sudanese model weighed only with an empty magazine. The price, including cleaning kit and four magazines, was US $225 per rifle. All AR-10s, whether produced by ArmaLite or by A.I., used the same Stoner-designed 20-round lightweight aluminum 'waffle' magazine with pressed-in, corrugated sides, intended to be discarded in combat once emptied.