You don’t need to trap this to tame, it’s a solo tame. If you run up to it, it will go into turret mode then you need to walk circles around it and keep hitting with tranq until it eventually tries to walk away *in turret mode so really slow walking*
These should be your first tame since there saddle is unlocked at level 27 in extinction also they can shoot faster then an automatic turret also I've just read this they can block turret bullets so I hope they can damage tek turrets with there needles or out gun all turrets.
If you sneak up on it (ghillie suit , cactus brooth ) and get up close it won't start fireing so just shoot it with darts entill it's knocked out also if your planning to do this on higher levels you might want more health so use mind wipe tonic if you think you need more health. p.s it hits you instead of shooting you when you get really close.
Make a 2x2 cage with ramps and a door. Lure the velonasaur in with a flyer. If you stay close to him he won’t enter turret mode. Leveling melee raises his projectile hit points. Also level stamina to attack longer. A high level can shred everything I’ve come across. Can’t wait for an imprinted one for the speed bonus.