Spell it out to me like I'm 3yo, want get this method down for my own run(s).
Best / easiest way to get mech part salvage it to put arrow to its knee so it gets knocked down and then core it?
Edit: Or method is turning enemy pilot into meat paste?
So, where he is in the difficulty scale enemy pilots have about 3 or 4 hit points. He racked up 3 in a row and maybe a 4th from random head shots to kill the pilot and get max salvage due to how the salvage system works.
First you use PStrike to called shot on a leg, this shot needs to be high dmg, you don't care if you overkill in to the side torso, you actually want to pick a leg who's torso has ammo in it.
This knocks them down for 1 pilot hit.
Then, once it is fallen, you make normal called shots (saving morale) with the rest of your forces. Go for that torso you just cut the out from. With the leg gone, damage to the torso is more concentrated, if you get an ammo explosion it makes things easier.
This adds 1 injury. 2 Pilot hits total.
Once that side is gone, you make called shots to the other torso. This puts the 3rd injury on and that's game for Guts 3 or less. If they have 4 HP, you will need one more pilot hit to seal the deal.
As he can't advance the story, he's unlikely to see harder enemies that may have 4+ HP which makes this tactic much harder, but still easier than going for head destruction.
EDIT: The ON1 flight clarified torso ammo explosions only deal 1 pilot injury.