Is the Combat MG Mk II worth it in 2026?

Yes - it is one of the three essential Mk II conversions along with the Heavy Sniper Mk II and Special Carbine Mk II. At about $310,000 fully built, it is the best sustained-fire weapon in the game.

How much does the Combat MG Mk II cost in total?

$133,800 for the gun and conversion ($14,800 + $119,000), or about $310,000 with armor piercing rounds, heavy barrel, and the 200-round extended clip, as of July 2026.

What are the best attachments for the Combat MG Mk II?

Armor piercing rounds, the heavy barrel, the 200-round extended clip, and a grip. AP rounds are the class-defining pick because armored NPCs and vehicles are the only things that slow it down.

What is the Combat MG Mk II conversion cost in GTA Online?

$119,000 at any Weapon Workshop, on top of the $14,800 base Combat MG. The conversion itself needs no Bunker research; only certain ammo types and attachments do.

GTA Online

Combat MG Mk II

The Combat MG Mk II costs $119,000 to convert (about $310,000 maxed) and is a must-buy - the best sustained-fire weapon in GTA Online for heists, setups, and business defense.

Video via Mr Lawrence

Key facts

Cost	$119,000 (Mk II conversion at a Weapon Workshop)
Mk II conversion cost	$119,000 (base Combat MG is $14,800)
Total cost to max	About $310,000 (base + conversion + AP rounds, heavy barrel, 200-round clip)
Worth it verdict	Must-buy - top three Mk II conversion for any grinder
Best ammo type	Armor piercing rounds ($82,550 mag, research required) - 80 rounds per mag
How to unlock	Own a Combat MG + any Weapon Workshop; research only gates special ammo
Damage	47 per shot (up from 45), highest sustained output in the LMG class

The Combat MG Mk II is the Weapon Workshop upgrade of the Combat MG and the strongest light machine gun in GTA Online. The conversion raises damage per shot from 45 to 47 at the same fire rate, and unlocks the Mk II ammo list: tracer, incendiary, armor piercing, and FMJ rounds. With a 100-round belt as standard and up to 200 with the extended clip, nothing else in the game maintains fire like it.

Costs, as of July 2026: the base Combat MG is $14,800 at Ammu-Nation and the conversion is $119,000, so $133,800 for the gun. The full grinder build adds armor piercing rounds ($82,550, research required), the heavy barrel ($66,500), and the 200-round extended clip ($28,975), which puts the realistic total at about $310,000.

Is it worth it? Yes, unambiguously - this is one of the three Mk II conversions every player should own, alongside the Heavy Sniper Mk II and a Mk II rifle. High per-bullet damage plus enormous magazine capacity means you clear entire waves of heist NPCs without reloading, and armor piercing rounds shred the juggernauts and armored vehicles that stall other weapons.

The recommended loadout is armor piercing rounds, heavy barrel, extended clip, and a grip; add a medium scope if you use it at range. Skip incendiary here - AP is strictly more useful because unarmored enemies already melt.

For money making, this is the single best gun for defensive grinds: bunker and business sale defense, Cayo Perico compound sweeps, Casino Heist setups, and survival waves all go faster behind a 200-round belt. The time it saves pays back the $310,000 quickly.

Tips

Armor piercing rounds are the first research to chase - they turn juggernauts and armored cars into routine kills.
Buy the 200-round extended clip immediately; never reloading mid-wave is the whole point of an LMG.
The heavy barrel plus a grip makes it accurate enough to replace a rifle at most mission ranges.
You cannot fire it from vehicles - keep an SMG or AP Pistol bound for drive-bys.
Use it for bunker and business sale defense; the sustained fire holds choke points other guns cannot.
AP mags hold 80 rounds instead of 100, so swap to standard belts when nothing armored is around.

FAQ

Is the Combat MG Mk II worth it in 2026?: Yes - it is one of the three essential Mk II conversions along with the Heavy Sniper Mk II and Special Carbine Mk II. At about $310,000 fully built, it is the best sustained-fire weapon in the game.
How much does the Combat MG Mk II cost in total?: $133,800 for the gun and conversion ($14,800 + $119,000), or about $310,000 with armor piercing rounds, heavy barrel, and the 200-round extended clip, as of July 2026.
What are the best attachments for the Combat MG Mk II?: Armor piercing rounds, the heavy barrel, the 200-round extended clip, and a grip. AP rounds are the class-defining pick because armored NPCs and vehicles are the only things that slow it down.
What is the Combat MG Mk II conversion cost in GTA Online?: $119,000 at any Weapon Workshop, on top of the $14,800 base Combat MG. The conversion itself needs no Bunker research; only certain ammo types and attachments do.

Video source: GTA Wiki (Fandom)

More GTA Weapons

Best Weapons in GTA Online

A curated list of the most effective weapons in GTA Online for combat, heists, and free roam, updated for 2026.

Cost: Varies; expect to spend over $1 million for all Mk II upgrades and ammo types

Heavy Sniper Mk II

The Heavy Sniper Mk II is the best weapon purchase in GTA Online - a $165,375 conversion (about $320,000 with explosive rounds) that one-shots players, helicopters, and most vehicles.

Cost: $165,375 (Mk II conversion at a Weapon Workshop)

Special Carbine Mk II

The Special Carbine Mk II costs $135,000 to convert (about $315,000 maxed) and is the best all-round assault rifle in GTA Online - the one Mk II rifle to buy if you only buy one.

Cost: $135,000 (Mk II conversion at a Weapon Workshop)