Baro Ki'Teer: 17/5/19

Reasonable Baro stock today, even if it is mostly repeats.
EDIT:

Primed Pack Leader was added in afterwards too.

New Items

• Primed Pack Leader - +66% Melee Lifesteal Link for Pets.
• Prisma Avia Ankle Plate - cosmetic.
• Mesa Immortal Skin - cosmetic.

Rankings

Must Buy

• Primed Target Cracker - +110% Crit Damage for Secondaries. Majorly increases damage output of crit secondaries.
• Primed Pistol Gambit - +187% Crit Chance for Secondaries. Major damage increase for crit secondaries, just not as big as PTC.
• (If on Switch) Ignis Wraith - an MR9 beam weapon with a very large AoE. Great Status Chance and decent crit, generally just a really strong weapon. Only buy it if you are on Switch, as its blueprint is otherwise readily acquirable from trading or certain Clans on all other platforms.

Good

• Vulkar Wraith - high capacity MR7 Sniper Rifle. Relatively weak by Sniper standards, with comparatively low crit, but is still very strong compared to regular primaries. Notably has access to a rather powerful Augment in Lasting Purity.

Niche

• Primed Slip Magazine - +55% Mag Capacity for Secondaries. Can be a nice mod to have, but is very rarely, if ever, worth taking over the many other good mod options out there.
• Primed Pack Leader - +66% healing to your Pet on your Melee attacks. Any decently modded melee will probably deal enough damage to fully heal your pet in one or two strikes with just regular Pack Leader, so the Primed is not really worth it. If your melee isn't doing enough damage to heal your pet in one or two hits, you should really be investing in better Melee weapons/mods instead.
  
• Primed Rifle/Shotgun/Pistol Ammo Mutation - improved Ammo Mutation mods. There are very few (if any) weapons that want Ammo Mutation, but can't be sufficiently supplied by the regular Ammo Mutation mods. If you're constantly running out of ammo, it might more be a problem that the weapon is too weak, than your Ammo Mutation is insufficient. 
• Sands of Inaros - quest to acquire Inaros. Always available from Baro, so is a low priority.

Do Not Buy

• 5x Corrupted Heavy Gunner Specter - limited use Specters with no special abilities, and very little damage output at high levels. Not worth using compared to a regular Warframe Specter, and a relative waste of Ducats.
• (If not on Switch) Ignis Wraith - blueprint is acquired from certain Clans, and can be traded. There are many players willing to give them away for free if you just ask.