Update 19.5 Heavy Weapons ListBlade• Galatine
• Gram
• Scindo
• Scindo Prime
• War
• Zenistar (Unlocked after logging in 300 cumulative days)
Hammer• Fragor
• Fragor Prime
• Heliocor
• Heliocor Synoid
• Jat Kittag
• Magistar
• Magistar Sancti
• Sibear
.
Unlocking Weapons19.5 Update:
You can unlock Fragor blueprint by completing the Mars Junction on Earth.
Most Heavy Weapons have blueprints in the marketplace, War is a reward from a very high level questline involving the Stalker and you'll get Broken-War (Sword) first. Gram is recommended and compliments Rhino Warframe well.
Lot's of weapons require a Mastery Rank, but by leveling weapons you increase your Rank so this shouldn't be a problem, just make sure to Rank up regularly.
Check here for required Mastery Ranks or the Marketplace.
Prime Weapons require Void completion, often high level Survival/Defense 'Rotation C' drops. These are endgame. I use
Primarch Prime Part Guide.
Leveling weapons to Rank 30The best way to level weapons is to play Survival or Defense missions and kill lots of enemies, then extract for the bonus exp, you'll get lots of weapon mastery whilst unlocking all worlds, doing alerts, unlocking other achievements and just playing the game. Remember to always swap for you next weapon and have one ready to swap.
Lots of Dark Sectors have Affinity bonus (+Shotgun), use a Warframe that supports you but doesn't really kill enemies so you rely on your weapons, being in a group spawns more enemies for more exp.
Elara on Jupiter is a great mission for Affinity, as the anti-moas spawn early and often, and they give a fair amount of affinity around 7-9x the exp of grunts.