While some may consider this to be a gun, I would like to propose it as a way popping some of those pesky plants from range.
This is how it could work;
Consumable item that is attached to terrain tool and is launched/fired from front (think Halo needler but without the tracing effect)
Would only cause damage to alien life forms to avoid attacking other astroneers
Uses Aluminum to create projectile (max of 8 Projectiles?)
Semi Auto firing
Needs to be researched and would be a backpack blueprint much like how dynamite is created
I think we've all been to a few planets where you try to enter a cave and you're completely blocked by spikers. This could even the field and allow you to engage/neutralize the threat from safety. With the potential for new and more hostile threats, this could be a new way to combat them without feeling like too much of a gun.