While using solar boots and equipping -fusion rifle scavenger and -linear fusion Scavenger mod When picking up energy ammo you will also pick up a power ammo brick too. Only Linear Fusion in power slot will work do far in gambit and crucible/comp. Using arbelest in kinetic slot and Komodo-4FR in power. Any kill seems to work and just walking over energy brick will give Power ammo even while not accessible in Comp/Crucible with timer.