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HSTV-L

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|In early 1977 the Army selected proposals from AAI and Pacific Car and Foundry for HSTV(L) concept feasibility analysis.
In December 1977, the Army awarded the HSTV(L) fabrication contract to AAI.
Meeting the HSTV(L)'s weight target was one reported early challenge. As of September 1981, there were no significant problems reported with the HSTV(L).
Martin Marietta expressed interest in a joint venture with the AAI Corporation to enter a version of the HSTV-L into the U.S. Army's Armored Gun System competition. The corporation apparently decided that the technology was not sufficiently advanced to proceed with radical changes in the HSTV-L to meet the new AGS requirements, therefore, they did not bid on the program.





The main armament consisted of an Ares Incorporated XM274 75mm CTA autocannon with 2-axis stabilization capable of firing Armour-piercing fin-stabilized discarding sabot and high-explosive. Secondary armament consisted of a coaxial 7.62 mm M240 machine gun and a commander's M240. AAI had originally planned to place a 0.50 caliber (12.7 mm) heavy machine gun at the commander's hatch.
Pacific Car's proposal mounted the Ares 75 mm gun in an external elevating trunnion mount alongside a coaxial 25 mm M242 Bushmaster autocannon. Twenty-two 75 mm ready rounds (11 APFSDS and 11 HE respectively) could be carried in a magazine and thirty-three more could be carried in hull storage. A 40mm grenade launcher was originally included, but removed during a review of the proposal.
The AAI proposal called for sixty 75 mm rounds. As built, the test vehicle had only 26 rounds, but provisions existed for the original 60 rounds in the turret. The projectiles were stored vertically in a magazine beneath the right side of the turret and fed vertically into the rotating breech with the shell casing being ejected vertically upwards. Unlike the Pacific Car and Foundry proposal all rounds were accessible to the autoloader and there was no secondary ammunition storage.

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