MUTA-AP-09334

From Halopedia, the Halo wiki

Template:Ratings MUTA-AP-09334 is a type of ammo manufactured by Humans and used in handheld machine guns. MUTA-AP-09334 is designated as armor piercing ammunition, and usually only used when taking on light tanks...or an enemy in advanced armor systems such as the MJOLNIR armor.

MUTA-AP-09334 is .30 caliber, allowing it to be used in Confetti Makers. It is unclear if the UNSC uses this type of ammunition, but it has fallen into use by the United Rebel Front[1]. for their "Confetti Makers"

References

List of UNSC Infantry Weapons
Pistols and SMGs M6 series (M6C Magnum Sidearm · M6D Personal Defense Weapon System · M6G Personal Defense Weapon System · M6J Carbine) · M7/Caseless Submachine Gun · M7S Submachine Gun
Assault rifles and carbines MA5 Series (MA5B Assault Rifle · MA5C Assault Rifle · MA5K Carbine) · MA3 Assault Rifle · MA2B Assault Rifle · BR55 Battle Rifle · BR55HB SR Battle Rifle
Shotguns M90 Shotgun
Sniper rifles SRS99C Sniper Rifle · SRS99D Sniper Rifle
Rocket launchers M19 SSM Rocket Launcher · M19-B SAM Missile Launcher · M41 SSR MAV/AW
Machine Guns and support weapons AIE-486H Heavy Machine Gun · M247 General Purpose Machine Gun · NA4 Flamethrower · M7057/Defoliant Projector · LAU-65D/SGM-151 Missile Pod · Weapon/Anti-Vehicle Model 6 Grindell/Galileian Nonlinear Rifle
Grenades and explosives 102mm HEAT · C-7 Foaming Explosive · C-12 Shaped Charge · Fougass · Fragmentation Grenade · M383C Demolition Kit · Napalm Grenade · Satchel Charge · Smoke Grenade · Sonic Grenade · Thermite-Carbon Cord · Thermite Grenade
Ammunition used M225 SAPHE · 12.7x99mm · 14.5x114mm · 0.390 caliber · 0.450 caliber · 7.62x51mm NATO · 9.5x40mm M634 X-HP-SAP · MUTA-AP-09334 · M443 Caseless FMJ · Soellkraft 8 Gauge Shell