This gun has been through 44 wars. It's on its 45th one. Hence why it's named WAR-45.

Weapon showcase:

The WAR-45 unlocks at level 45 and appears as the H&K UMP-45 (Jackal Submachine Gun).

Uses the same stats as the Jackal with alterations to the mag size and total ammo capacity, and reload timers.

Includes 4 unique weapon mods:

Spoiler!

Extended Magazine (+10 rounds, +35 total ammo, +4 stability, -3 concealment, +0.8s reload time)
Quick-pull Magazine (+4 stability, -1 concealment, -1.4s reload time)
Short Magazine (-10 rounds, +35 total ammo, +4 stability, +2 concealment, -1s reload time)
Minimized Hook Stock (+8 accuracy, -4 stability, -1 concealment)

Note: Just like the FIK-22, the WAR-45 uses pistol extensions to keep up with the authentic feel.

Known issue: Just like on the PAYDAY 3 CAR-4, the mag is FOR SOME REASON slightly desynced during non-empty reloads.

QnA:

Q: Any more PAYDAY 3 custom weapons?
A: I'm considering porting the Blyspruta LMG and the Boys in Blue weapons once those get released, but as for the other base game guns... Unlikely.