Best C9 SMG Build in Call of Duty: Black Ops 6

The MP5 C9 Submachine Gun in Call of Duty: Black Ops 6 follows in its predecessors’ footsteps as one of the best weapons in the game. It’s not the top of the heap, but it rarely has been, relegated as it always is to just below top-tier. With the right Gunsmith build, however, you can make the C9 a monster, and the one listed here is fantastic.

The Best Attachments to Use on the C9 SMG in Call of Duty: Black Ops 6

The C9 is actually a solid weapon without a single attachment, easily one of the best guns in Black Ops 6. Kitting it out with the stat boosts from the best build will take it to that next level. No, it won’t quite reach the heights the Jackal PDW can get to, but it can definitely be competitive. Especially since so many of the maps in Black Ops 6 are close quarters. Here are the attachments I recommend for the best C9 SMG build.

C9 Muzzle Attachment: Compensator

What’s great about most of the attachments in Black Ops 6 is the lack of a major downside, a major change from the Modern Warfare reboots. That means when the Compensator grants a massive buff to your vertical recoil control, you won’t pay for it with increased ADS time or an Aim Stability debuff. I think the compensator is more beneficial than a suppressor for the C9 unless you’re going for a full stealth build. The usability the Compensator provides and the speed players move in Black Ops 6 make going loud a more viable option.

C9 Barrel Attachment: Long Barrel

I think there’s a place for the other barrel attachments on the C9, but it’s hard to argue with a flat bonus to the weapon’s damage falloff range. Making an SMG more consistent to a longer range is more valuable to me than whatever bonus to bullet velocity would do for consistency within a gun’s default range. Don’t be like me and try to outshoot an assault rifle or, heaven forbid, a sniper with the C9, but with the Long Barrel equipped, you have that couple extra meters of lethality that can come in very handy.

C9 Magazine Attachment: Flip Mag

Yes, you’re losing a magazine out of the C9’s inventory with the Flip Mag attachment, but you gain that extra bit of reload quickness, ADS speed, and sprint-to-fire speed you might need to win a fight. The bonuses to the three stats are modest, but you can combine them with other attachments I’ll list shortly for a more reliable weapon in a fight, both as they start and after they finish. The animation is nice, too.

C9 Rear Grip Attachment: CQB Grip

Combining the sprint-to-fire speed bonus from the Flip Mag with the buffs from the CQB grip makes the C9 a very forgiving weapon to spring around the map with. That you also get slide and dive-to-fire bonuses is even better because you should be doing a lot of both in Black Ops 6.

C9 Stock: No Stock

It probably took me the longest to settle on a stock choice for the C9 because all of them have their benefits. However, as an SMG, mobility is king. With No Stock equipped, the C9 gains a massive bonus to both hipfire and strafing movement speed. There will be times when you come across an enemy before you’re fully prepared to ADS at them, and the C9 will want as many movement speed and hipfire buffs as possible, especially in a world where the Jackal PDW exists.

With this C9 build, you should have a much easier time taking on enemies in Call of Duty: Black Ops 6 multiplayer. You will need to pick your battles, as SMGs aren’t the world-beaters they were in other games, but they’re probably the best weapon class in the game.

For more on Black Ops 6, check out our guides hub.