Their ranged attack is only effected by melee damage when ridden. If used as a turret (which is what these things are best at) then only do health and stamina. Even a freshly tamed 224 can handle blue and yellow drops alone.
Upgrade melee on your mount, the rest just do health and stamina. A ridden imprinted velo can do literal thousands of damage per second, and a decent turret can do it’s dps (shoots about five times a second I think, so 100?) for about thirty seconds.
Screw the giga. This is the most OP creature in the game. Pump all levels into stamina, damage, and health. They will literally kill everything in their path. I also recommend putting them on a quetzal. Boom. You get a legit badass fighter jet with infinite ammo.
Very handy and one of my favourite by far. They're just a walking spiky raptor that has multiple abilities similar to how the Theri does and is just a war machine. To tame you just have to wait until it's stationary in its turret mode, (Where it's face opens up and begins shooting) and begin spinning around it as it is very slow. Or just trap it. Either way, I used shock darts and got it out in 3. Just feed it meat and wait.
Once you take it you'll soon see its ability and power, and as far as suggested upgrades, I'd advise leveling up health, damage and stam most, but be generous to speed as well as it is naturally slow.
The abilities go as follow. (Xbox)
Right Stick (Press) (R3) - Thrash
Spins around lashing tail and head shooting darts in a 360° arc around you quickly.
Left Bumper (Press Once) (LB) - Activate Sentry
Opens his face and slows you in which you can begin to shoot spins extremely fast in an accurate direction. Press again to deactivate.
*IN SENTRY* Right Trigger (Hold) (RT) - Shoot
Once in sentry mode, hold RT and aim in the direction to furiously mow down anything that looks at you the wrong way.