The Mark 10 is the first non-DLC automatic sidearm available, and has good firepower due to its damage and high rate of fire. These benefits are offset by its very poor accuracy and high recoil, making it mostly useful at close range.
The gun's generous magazine size of 40 (48 with extended magazines) gives it an edge over similar fast-firing SMGs, but the player must still be careful not to deplete their reserve ammunition with the extremely high rate of fire.
Installing modifications to increase accuracy and stability makes it a very good weapon for engagements up to medium range; consequently it is best used as a secondary to complement a long-ranged weapon like the M308 or any Sniper Rifle.
Although the main flashlight has a toggle switch, the laser sight component of the LED Combo is pressure-activated, meaning the laser will stay on as long as the pressure switch is depressed. This switch is not placed where it should be, however (on foregrips, magazine wells, etc...) and is instead ziptied to the main taclight, leaving no plausible mean for the user to toggle it without awkwardly moving their off hand off the weapon and gripping the attachment itself.
Upon release, the default reticle of this sight was a chevron instead of the retail version's red dot. After the release of the Gage Mod Courier DLC, it was reverted to the regular sight's red dot.
It is functionally the same as the standard Military Red Dot Sight, but the sight's casing is tan instead of black with the line "A-10" scrawled on near the adjustment knob. The sticker on the lens cap's interior also says "I <3 Payday" instead of having a picture of an American flag.
This sight was based on the Aimpoint CompM2 optic. While it is portrayed as a high-zoom scope in-game, the CompM2 is actually a reflex sight, meaning it offers no magnification in reality.
The Mark 10 is based on the MAC-11 as evident by the stamping on its right side. The in-game magazine of the Mark 10 holds 40 rounds despite being modeled after a 20-round stick magazine.
While the MAC-11 is an open bolt weapon, inspecting the Mark 10 would show its bolt in the forward (closed) position at all times despite the charging handle correctly locking back after each shot and after reloading.
Due to the shared animation rigging with the pre-Update 79 CMP, the player character will also press on the Mark 10's magazine well during a reload as if the weapon has a thumb mag-release, despite the MAC-11 being designed with a heel release.
The Mark 10's old inventory icon lacks its magazine.
The Mark 10 is the only weapon used by most gangsters (the gangsters in Hotline Miami use other weapons beside the Mark 10), giving them a surprisingly high DPS as they're capable of easily shredding through armor in just a few bursts. It is also the sidearm used by Chains and Sydney when controlled by the AI, which they draw out when downed or idling in a combat heist.
The Mark 10s used by the AI also sports an integrated tactical light mounted near the trigger guard, instead of the separate attachment that is mounted to the right side of the weapon.
Despite being a machine pistol, the Mark 10 is classified as an SMG in-game.
The Mark 10 was featured in a video by GameSpot as part of pre-release promotion.
With the Extended Magazine equipped, the Mark 10 cannot even perform a full reload once, after emptying the initial, loaded magazine. With 80 total rounds and a magazine size of 48, the high rate of fire, decent damage output, and impressive stability gained from fully modifying this weapon become rather moot, as it will run out of ammo completely with only brief use in a firefight.
As of Crimefest 2015, the total ammo pool for the Mark 10 has been increased to 160 rounds. This allows for three full reloads and one partial reload.