Efficient C4 with Stun

This build gives you 4 C4 which means you gain 2 back every resupply.

Use C4 to:

1. Blow up magma volcano vents/air vents that disrupt ziplines
2. Mine minerals if you aren't running TFC
3. Most importantly: AOE stun and kill HVT targets (wardens) or big groups of grunts.

The stun gives you just enough time to revive a single person before the bugs recover.