
In gameplay, the M512 is unable to fire at anything too close to the Scorpion, as the cannon cannot depress to that shallow an angle. Because of its large area-of-effect and high velocity, the cannon is a very useful anti-infantry weapon as well, able to kill even the toughest enemies (like Hunters) with a single blast. Even heavier vehicles like the Covenant Wraith can only withstand two to three rounds before being destroyed. The cannon has very little recoil, which may be attributed to an added muzzle brake or to other aspects of its design. The M512 can effectively destroy any light vehicle with only one shot. The S1 is also effective at breaching walls and damaging structures or other vehicles. The canister round is lethal against enemy infantry when machine guns or other weaponry cannot be used effectively. Another type of ammunition employed is the S1 Canister Shell, which provides increased destructive capabilities without the use of traditional high explosives. It is accelerated to a high velocity and can strike a target at extremely long ranges. This shell sacrifices armor penetration for larger amounts of high explosive filler. The M512 uses a wide variety of 90mm ammunition, the most commonly employed of which is the 90mm tungsten Armor Piercing Ballistic Capped Round.

Unlike modern tanks however, the 90mm Cannon is mounted on the aft section of the Scorpion's chassis and contains no crew compartment, as the loading is done automatically and the targeting and firing is performed from the cockpit electronically.

The 90mm High Velocity Cannon is fitted with an insulating thermal jacket to reduce gun-barrel warping caused by uneven thermal expansion. A gyroscope is used to stabilize the cannon, allowing it to be effectively aimed and fired at the "short halt" or on the move. The 90mm cannon is mounted in a fully-traversing turret mount, which allows the cannon to traverse 360 degrees horizontally and to depress from -10 to approximately +60 degrees vertically. The M512 90mm SBHVC is the primary weapon of the M808B Main Battle Tank, and is mounted on the rear of the tank's chassis.
