The Special Carbine Mk II is the Weapon Workshop upgrade of the Special Carbine and the consensus pick for best Mk II assault rifle. It combines high per-shot damage with low recoil and a fast fire rate, and unlocks the Mk II ammo list: tracer, incendiary, armor piercing, and FMJ rounds. If your loadout only has room for one serious rifle, this is it.
Costs, as of July 2026: the base Special Carbine is $14,750 at Ammu-Nation and the conversion is $135,000, the most expensive rifle conversion, for $149,750 on the gun. The full build adds armor piercing rounds ($90,750, research required), the heavy barrel ($49,000), and the 60-round extended clip ($26,450), which brings the realistic total to about $315,000.
Is it worth it? Yes. Against the Carbine Rifle Mk II it hits harder per shot with comparable handling, and against the Bullpup Rifle Mk II it is simply better everywhere. The premium conversion price stings, but a rifle is the weapon you actually hold for most of every mission, so cost per hour of use is the lowest in your arsenal.
The recommended loadout is armor piercing rounds, heavy barrel, extended clip, medium scope, and a grip. AP rounds counter the armored NPCs in Casino and Cayo Perico content, the heavy barrel protects damage at range, and 60 rounds covers full room clears. Swap to standard ammo against unarmored crowds since special mags drop to 20 rounds.
For money making, this is the default tool for contact missions, heist setups, client jobs, and security contracts - the content you grind daily. Faster clears compound into real hourly gains, which is why it belongs in the essential three alongside the Heavy Sniper Mk II and Combat MG Mk II.
