You will want high pierce guns as enemies start getting very high innate armour that completely negates damage, you can test your guns at the firing range

Guns within the same catagory share ammo pools

Potential: How well stat rolls can bring up DPS, the best gun I have will determine the rank
Extremely Low ~1K
Low ~5K
Medium ~10K
High ~25K
Extremely High ~50K

Full Auto: Holding down the mouse button keeps firing
Semi Auto: Must click to fire once, ruins high DPS guns as you will always be capped by how fast you can click
Note: Extreme RPM Semi Auto guns become burst fire

Drops: Which faction's enemies and loot boxes that you can get this gun from

Higher Loops have better RNG and bigger maxes on stats

Glock 19
Potential: Extremely Low
Semi Auto
Lanun: Rusher, Bandit, Soldier, Grenadier

BAD-AK
Potential: Extremely Low
Full Auto
Lanun: Jena duo
Specter: Light

MP5K
Potential: Extremely Low
Full Auto
Lanun: Rusher, Bandit, Soldier, Shielder, Grenadier, Drone

P90
Potential: Extremely Low
Full Auto
Lanun: Shielder, Grenadier, Psycho, Juno solo, Kuma, Beruang, Rogue Sister

Keris V-Tor
Potential: Extremely Low
Full Auto
Lanun: Jena solo boxes, Rogue Sister
Specter: Light, Hans boxes

SPAS-12
Potential: Extremely Low
Full Auto
Lanun: Grenadier, Psycho, Juno solo, Kuma

AA-12
Potential: Extremely Low
Full Auto
Lanun: Jena solo, Duo bosses boxes

Saiga-12
Potential: Low
Semi Auto
Specter: Specialist, Hans boxes

Tavor-12
Potential: Extremely Low
Semi Auto
Specter: Specialist, Hans boxes

Famas
Potential: Extremely Low
Full Auto
Lanun: Psycho, Juno solo, Jena solo boxes, Kuma

F2000
Potential: Extremely Low
Full Auto
Lanun: Psycho, Duo bosses boxes. Kuma

PDR
Potential: Medium
Full Auto
Lanun: Duo bosses boxes, Gate Factory Entrance boxes, Rogue Sister

HK G36C
Potential: Low
Full Auto
Lanun: Assault Automation Factory boxes
Specter: Ubersoldat

AR-10
Potential: High
Semi Auto
Specter: Assault

SR-1
Potential: High
Semi Auto
Specter: Assault

AWM
Potential: Low
Full Auto
Lanun: Duo boss boxes
*Really funny seeing a bolt action gun fire fully automatic without ever bolting

Beretta 50-Cal
Potential: Low
Full Auto
Lanun: Jena duo
Specter: Boxer

MSG-90
Potential: Low
Semi Auto
Lanun: Duo boss boxes, Assault Automation Factory boxes

M240B LMG
Potential: Extremely High
Full Auto
Lanun: Juno duo, Gate Factory Entrance boxes
Specter: Boxer
*Best full auto with high pierce for bosses

HK 11
Potential: High
Full Auto
Lanun: Gate Factory Entrance boxes
Specter: Heavy, Ubersoldat, Boxer
*Second to the M240B

Milkor MKI
Potential: Low
Full Auto
Lanun: Juno duo
*The only AOE gun, perfect for crowd control especially in later loops and doing all kinds of war crimes
*The AOE affect also directly bypasses Specter Ubersoldat and Specialist shields, also Hans' shield but his high boss armour makes it useless
*Does 100% damage to all standard enemies regardless of their armour, bosses have a separate Explosion armour rating
*Cannot crit and does not damage Juno and Specter structure targets

DLC weapons, no further info as I currently don't have the DLCs

C-Nar
Potential: Extremely Low
Lanun: Raksasa, Annihilator, Assault Automation Factory boxes

Tesla Gewehr
Potential: Extremely Low
Specter: Hans