Ah but...
Only 150 ammo? Only is probably not the best word, 150 direct hits(since the homing capabilities will have to be practically undogable for you to like it) with an ASMD combo blast would hurt alot, even if they did default damage, not the instant kill blasts the VGL5000000 uses, one shot is all that's really needed to clear out a small room, assuming the ratio ammo in pickup to maximum ammo is the same as the redeemer(likely since you can only get ammo from a weapon pickup), that makes 75 shots in a pickup, since the redeemer is often fairly easy to reach, unless the weapon didn't want to be picked up, and would attack people who went near it, and then obeyed whoever picked it up, it would not really have any balance at all.
Perhaps, instead, there should be only one, and doesn't replace the redeemer, like the man with the golden gun senario on goldeneye, players should get extra frags for killing the VGL500000 user.