You’re best off deciding which one you want and sticking with it, but if you want to grab one early and switch to another later, that shouldn’t prove too difficult either.

This costs 5,000 Element Zero though, so you probably won’t be able to do it after each mission. One great thing about this weapon is that it's excellent for squadmates, as they are forced to take cover more regularly the M-4 Shuriken helps keep them alive and fighting much longer. You can only have one bonus power active at once, but you can research Advanced Training over and over again if you want to, switching out the power each time. Related: Mass Effect 3: All Consequences Of Mass Effect 2's Suicide Mission Once you complete each of their loyalty missions though, you will be able to research their bonus power via Advanced Training in the Tech Lab. some weapons also can be researched like the missle launcher which you need to find / purchase the research then put x number of material into brining it to fruit (mordins place cic left) dlc stuff you have added to weapons locker as soon as you can access. That’s because the Advanced Training research relies on squadmate loyalty, and immediately after Horizon, none of your squad will be loyal. while in normandy go to squad status (or prior to mission where you pick a team/landing on omega,citadel,etc.) and hit x on the category (ie assault rifle 3 options) for shepard or squad member and select it.

This is a research project that becomes available after completing Horizon, although immediately after Horizon, it is useless. In Mass Effect 2, all conventional weapons save sniper rifles suffer a damage penalty at extremely long ranges and benefit from a damage increase at very close (nearing melee) ranges. However, throughout Mass Effect 2 Shepard will also be able to unlock a bonus power via Advanced Training. Commander Shepard has a wide variety of powers available in combat throughout Mass Effect, with different powers available depending on whether Shep is a Soldier, Adept, Vanguard, Engineer, Sentinel, or Infiltrator.

Mass effect 2 unlock all weapons