Mk II weapons are a set of enhanced weapon variants introduced in the Gunrunning update for GTA Online. To access them, you must own a Bunker and complete Research projects to unlock each upgrade. Once unlocked, you can convert compatible standard weapons into their Mk II versions at a Weapon Workshop inside the Bunker, an Avenger, or a Mobile Operations Center.
Each Mk II weapon features better accuracy, damage, range, and fire rate compared to its standard counterpart. Additionally, they support special ammunition types such as Armor Piercing, Full Metal Jacket, Incendiary, Explosive, and Tracer Rounds, which can be purchased from the Interaction Menu once unlocked. The Mk II variants also allow for unique attachments like scopes, suppressors, and grips, though some attachments are exclusive to specific weapons.
Mk II weapons are crucial for high-level PvE and PvP content, especially in missions and heists where enemy armor or vehicles are common. The Explosive Rounds for the Heavy Sniper Mk II can destroy most aircraft with a single shot, while the Combat MG Mk II with FMJ rounds shreds through armored vehicles. Prices for conversions and ammo vary and may change with updates; always check in-game for current costs.
To make money efficiently, investing in Mk II weapons is recommended for players who frequently engage in combat-heavy activities like VIP Work, Client Jobs, or the Cayo Perico Heist, as they reduce time-to-kill and improve survivability.
