Just an observation, gunslingers do not have access to a piercing gun that they can use while moving
the callahan is great (i have one) its almost as powerful as a rigadoon per shot - which is fantastic, but it locks u in place while firing, not a huge problem to fire a single shot, except against T3 wolvers.
the needle lines, plague and blitz are considerably worse, your locked in position while firing a spread of 6/7 shots, more than long enough for a devilite to quickstep out of range and throw office furniture

I also noticed that most of the gear kozma sells can be upgraded along different alchemy paths,
calibur ->cold iron
defender -> heater
cobalt armor -> vitasuit (kinda)
blast bomb -> all other non chemical bombs

all thats missing is a blaster variation and helm variation

so my idea is create a piercing blaster variant, starting at 3/4*
that way the blaster may see more action and theres a piercing gun that you can run and gun with.
so far as new models are concerned, i dont think any are necessary, just reskin the blaster line with different colours.

I know that there is the antigua series, but they are not pure pierce and as such cant really be considered to be piercing weapons. they're great, i love my peacemaker but its just not a real pierce gun.

PS im also of the opinion that there should be another version of the antigua which deals shadow and elemental, round off the series will all split damage types - though a revolver being useful against constructs and slimes, seems a little odd