I just had this crazy idea for a a brand mission that is a contract side quest. V has track down and disable a Cyber Dinosaur that is a T Rex just like the T Rex part from Jurassic Park. This Cyber Dino is terrorizing Night City attackng and killing civilians and causing major damage and starting fires and Max Tech and Arisake both trys to stop the thing but are wiped out and V comes across the battle site where both were using brand new experimental prototypes and weapons and they left behind an Ajax vehicle which V can use and has all weapons systems runing and can use the weapons. Max Tech were also using Mark 2038 50 Caliber HMGs and V can permanently use it as a weapon and upgrade it and it has an advanced targeting system that you can ADS instead of shooting from the hip. The HMG has an ammo counter and I am guessing at one time you probably could buy or find heavy 50 caliber ammunition.. V tracks the thing we'll past Night City into the Sierra Nevada Mountains to Northern California near the Ruins of Fresno and Sacramento areas where he defeats the thing and this opens up new areas to explore.