The Mars Automatic Pistol was a semi-automatic pistol developed in 1900 by Hugh Gabbet-Fairfax and distributed by Mars Automatic Pistol Syndicate Ltd. Manufacture ceased in 1907. It used a unique long recoil rotating bolt action which ejected spent cartridges straight to the rear, and the feed mechanism is unusual in that it pulls cartridges backwards out of the magazine and then lifts them up into the breech face. The weapon was available in a selection of four proprietary cartridges.
The Mars Automatic Pistol was rejected by the British War Office as a possible replacement for the Webley & Scott revolver because of the unacceptably large recoil, considerable muzzle flash, and mechanical complexity. It has since become a collectors' item because of its rarity and as an example of the earliest developments in semi-automatic pistols.
— In-game description
The Mars has high stopping power, though the Bodeo 1889 has higher raw damage at close range. It also has a high magazine capacity, the highest of all sidearms, compared to other automatic pistols. However, it pays for this power with high recoil and a comparatively low rate of fire.
The Mars Automatic has unusually high minimum damage at 23 past 30 meters. As body shots for most sniper rifles deal 80 damage outside of their sweetspot zones, a single follow up shot with a Mars Automatic can kill any target at any range--something no other Scout sidearm can do.
Unusually for such a powerful weapon, the Mars Automatic fills the role of a medium damage, medium rate-of-fire pistol for the Scout kit. It is unique in this role compared to pistols used by other classes; the C96 and Repetierpistole M1912 are strip fed whilst the Howdah Pistol is four shots in separate barrels, making the Mars Automatic the only detachable-magazine pistol in this role in Battlefield 1.