The "shield punch" beam augment does nothing but reduce attack by 25% because the stat that's supposed to bypass shield doesn't work properly.
Punch has IgnoreShield at flat 0.5, but that stat does nothing at any value below 1.0. At anything above, shields are fully ignored.
I'm not sure if it's supposed to be 50% chance for full bypass or 50% of the total will always bypass, but neither is the case. The same is true for the (currently unused) PD and armour bypass stats.
EDIT: this somehow ended up on the wrong forum. This is supposed to be in support.