Disclaimer. This is a Pve squad healer build. Not solo. Not pvp.
This is a proper medic build. All your focus should be going into making your heals as strong as possible. Your weapons don't matter. I just picked some to make the build. Talents on your weapons don't matter. You don't need firearms or stamina. I've never once criticized a reclaimer for not killing enough enemies. You are there to keep your squad alive. That is all. This set up will produce a super strong support station with good range and couple that with defib and you will be healing 30k a second. You won't do any damage, but who cares? You are a healer. So just heal. Cooldowns won't be an issue. Some folks say the 6th piece of reclaimer isn't needed. They dumb. Run the full set and legendary missions will be easy cause everyone will stay alive. I change mods based on content. Resistance I run speed and first aid mods cause range ain't an issue when you are camping. Legendary missions and incursions I like to run range and first aid cause extra range is helpful when your squad is always on the move. If running easier content I drop defib for a flame turret for some crowd control. Swap out battle buddy for wildfire if running turret.
If you are doing pugs for missions then you may get some groups who can't put out enough DPS to clear anything. It happens. With 3 good DPS players in your squad I promise you that your small amount of damage sacrificed to focus on high skill power won't be missed. God's speed and good luck.