This guide will show you how to unlock the WM-29 pistol and the new Season’s Greetings Livery on your MK2 pistol in Grand Theft Auto 5 Online.
First, you’ll need to find the Maze Bank shootout event from 8 pm to 6 a.m. during game time. You have to be in an invite-only session to do this, and you will need one person in your session. You’ll find a red blip on your mini-map, and the event will happen at the top of the Maze Bank building.
Once you reach the rooftop, you will find a lot of cops and enemies there. You need to bring the target down, and he will drop the WM 29 pistol indicated as the blue blip on your mini-map. You need to loot it, and you will unlock the WM 39 pistol and Greetings Livery for the MK2 pistol.
Now you can customize it from the ammunition store.