I haven't found any heavy weapons to keep. There are Heavy Weapons, but you just pick them up off the ground and they are Auto Equipped for a short time. You don't own them. As soon as you switch back to your main weapon, you drop the Heavy Weap on the ground. The heavy weapons seem to show up right about the time you'll find them most useful, such as the rocket launcher right before a certain type of enemy.
Well that sucks. I loved just spamming those lovely rockets hehe
Oh And its posted today!!!!!
"Heavy Weapons include missile launchers, grenade launchers, particle beams, flamethrowers, lightning, and cryo (freezing) guns."
You just have to find 'em.
Not sure if it's in the campaign (barely past the first mission, damn youse import bonuses and classes that aren't terrible!) but Link this is basically a heavy weapon. That goes in the assault rifle slot. Same can also be said for the Scorpion: Link
I've solo'd up to wave 9 on bronze just by shooting people in the face with the M-37. If they don't die, they get THA GRAAL! Which is just the Krogans being unoriginal and shooting railroad spikes from their shotguns.
All the heavy weapons are in game, u can pickup and use it on that specific mission. After the mission that weapon wont get added to weapon inventory, so use them well durin the mission.
heavy weapons can be "given" to player and even to squadmates
command for this which you need to put in bindings in coalesced.bin is as follows
( Name="F3", Command="giveitem self cain" )
which is a nuke launcher
to give it to a "target" use
( Name="F4", Command="giveitem target cain" )
The "how to" i described in the next link
Link