M7A3

The M7 family of assault rifles, including the M7A3, is the Sol Defense Corps' standard-issue assault rifle capable of deployment on any planet, atmosphere or installation. It is rated for sustained usage in a vacuum and utilizes redundant mechanisms to keep the weapon operational in a wide variety of environments. It features a variable firerate, trigger-pull and stock-length, and is often used with its three-round burst fire mode as standard usage.

The barrel is constructed out of advanced alloys and is rated for pressure loadings up to 3 times the standard force exerted by its paired cartridge. The Stock can be swapped out for folding variants or braces.

The rifle is pulse-action, where the mechanism used to fire ammunition is done through an electrical discharge (a "pulse") rather than a conventional striker to detonate an explosive. This allows for the elimination of the striker and allows the weapon to be more reliable, with less moving parts. The Bolt carrier is then cycled via a gas-piston system, where the bolt travels through a Linear Alternator, this Alternator generates enough charge for 15-20 shots with a single cycle, making the cell longevity theoretically infinite, the replaceable cell is used as a backup and is sufficient for 200-300 rounds.

Ammunition

Fired by the M7 and most of its variants is the 7x47mm CRC Cartridge. A more recently-developed cartridge, yet proven after the Martian Revolution, its a step-up from previous chambers with man-stopping power, ballistics, accuracy and adaptability to differing environments of planets, among other improvements, the round is propelled by a solid, self-oxidizing propellant that is designed to lessen carbon buildup on internal parts, reducing requirements for cleaning. The Cartridge case is also made out of a specialty-designed polymer to absorb the heat from propellant combustion, improving the weapons cooling characteristics.

M7AS

The M7AS is the special operations variant of the M7 designed for covert operations and greater stopping power. The weapon is fitted with an integral suppressor, a 3x magnification smart-scope, an under-barrel compact shotgun, and a thirty-five round magazine. The M7AS is chambered in M433SBS, a heavy 11x80mm cartridge which uses its large projectile mass to stay effective at subsonic speeds, making the AS variant an extremely lethal and silent weapon, even against some light armor, at the sacrifice of maximum effective range. The smart-scope generates a constantly-calculated impact point of the projectile both in the optic itself and on any connected Suit/Heads-Up Display, allowing for precise marksmanship in most situations.