I would like to allow my players to attach vibroknife as a bayonnet on their blaster rifles.
How would I go to implement this so that it would be "realistic" (not under or overpowered)? Also, should the knife be allowed to be modded separately from the rifle to make the bayonet more dangerous? Would the arrangement use hard points from the knife, the rifle, or both? How many? How would the knife's stats change when attached (I am thinking it should be possible to detach a baynet to be used as a regular vibroknife)? I assume stabbing someone with bayonet is more damaging than stabbing him with a plain knife.
What I am basically looking for is someone's (preferably playtested) ideas about the matter.