They're scaled about right compared to all the other things...
Which part of it do you have a problem with, the AP5 or the S4?
S4 means they wound Orks half the time, which makes sense because Orks and Marines half the time. This makes sense, as both Orks and Marines are pretty tough creatures.
In regards to the AP5, they'll punch right through Flak armor and everything else, but they can be stopped by Carapace. The 3 eyed chick in the Ragnar Blackmane series takes a bolt gun round to the chest while wearing carapace armor, and it stops it, so...not really that out of touch with the fluff.
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