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Back pack weapon holders for wave 3 Primemasters Bludgeon, Octopunch and Bomburst.
These particular designs are currently untested, i do feel confident there will not be any issues, however i can not offer say with more complete confidence.
the backpacks maybe very tight intially so i recommend using an existing 3mm weapon to hand to work into all the peg holes making sure they are free of any excess powder and what not before attempting to instal.
take care pegging the backpacks to the primemasters back, the backpacks can be tight so if they need to be removed do little back and forth twisting movements or in some cases use a small flat screwdriver to wedge them off as not to damage or stress the peg on their backs.