Multishot

Multishot is a feature normally encountered only on shotguns, but can be added to any weapon through equipped mods. Multishot increases the number of pellets (bullets, projectiles, bolts, etc.) the weapon will fire per shot, effectively allowing you to fire more bullets without consuming extra ammunition. If the pellet count results in a fraction, the fractional part will be a chance to fire one more bullet. This option might be turned off in certain weapons, such as Angstrum.

Most weapons only fire one pellet per shot, so Multishot will effectively turn them into miniature shotguns. Because every pellet has a chance to proc, increasing multishot will effectively increase the chance of obtaining a status effect.

Pellets Fired = Base Pellet Count * (1 + Multishot)

For example, a Hek with 120% multishot will have the pellet count of 15.4. This means it will fire 15 pellet per shot with a 40% chance of firing a 16th pellet.

Meanwhile, a Lex with 180% multishot will have a pellet count of 2.8. It will therefore fire 2 bullets with an 80% chance of a third bullet on that shot.

Since Multishot only changes the weapon's pellet count, all additional pellets will behave identically to the originals, including mod effects, spread, elemental damage, etc. If the weapon has no spread at all, the additional bullets will overlap the original. This can be verified by using a weapon such as the Dera with and without Heavy Caliber to increase spread.

Note that the in-game UI will consider any possible multishot capabilities when showing final damage numbers, and do not represent single-projectile damage. 

Pellet Counts

Shotguns

Multishot percent	0%	20%	40%	60%	80%	100%	120%
Sobek or Tigris	4	4.8	5.6	6.4	7.2	8	8.8
Sweeper	6	7.2	8.4	9.6	10.8	12	13.2
Hek or Phage	7	8.4	9.8	11.2	12.6	14	15.4
Boar	8	9.6	11.2	12.8	14.4	16	17.6
Boar Prime	9	10.8	12.6	14.4	16.2	18	19.8
Strun, Strun Wraith or Drakgoon	10	12	14	16	18	20	22

Pistols

Multishot percent	0%	10%	20%	30%	40%	50%	60%	70%	80%	90%
Angstrum	3-7	3-7	3-8	3-9	4-9	4-10	4-11	5-11	5-12	5-13
Bronco, Bronco Prime, Akbronco or Detron	7	7.7	8.4	9.1	9.8	10.5	11.2	11.9	12.6	13.3
Brakk	10	11	12	13	14	15	16	17	18	19
Multishot percent	0	100%	110%	120%	130%	140%	150%	160%	170%	180%
Angstrum	3-7	6-14	6-15	6-16	6-16	7-17	7-18	7-18	8-19	8-20
Bronco, Bronco Prime, Akbronco or Detron	7	14	14.7	15.4	16.1	16.8	17.5	18.2	18.9	19.6
Brakk	10	20	21	22	23	24	25	26	27	28

Fire Accuracy

For rifles and single shot pistols, fire accuracy is calculated using the following formula:

Accuracy% = 100 * shots hit / unmodified pellet count.

Because of this, is possible to have a fire accuracy higher than 100% with a rifle or single shot pistol using a multishot mod. For example, if you hit 468 shots and fired 342 shots using a rifle during a mission:

Accuracy% = 100 * 468 / 342

Therefore, we can conclude the following:

Accuracy% = 136.84%

Therefore, rifles can reach 190% accuracy, shotguns 220% and pistols 280% before counting punchthrough.

Multishot Mods

Weapon	Name	Stat	Power Cost	Polarity	Dropped By	Rarity
Pistol	Barrel Diffusion	20% - 40% - 60% - 80% - 100% - 120%	6 - 7 - 8 - 9 - 10 - 11		Grineer Seeker Infested T3 Defense Reward	Rare
Pistol	Lethal Torrent	10% - 20% - 30% - 40% - 50% - 60%	6 - 7 - 8 - 9 - 10 - 11		Nightmare Mode	Rare
Rifle	Split Chamber	15% - 30% - 45% - 60% - 75% - 90%	10 - 11 - 12 - 13 - 14 - 15		Corpus T3 Defense Reward General Sargas Ruk Leech Osprey Raptor Tier 3 Survival Reward	Rare
Shotgun	Hell's Chamber	20% - 40% - 60% - 80% - 100% - 120%	10 - 11 - 12 - 13 - 14 - 15		Corpus Drone Grineer T3 Defense Reward Tier 3 Survival Reward	Rare