i can scale them up or down as a whole, but the guns themselves would need to be modeled more with a blockhead in mind... EX: stock length and size relative to a player, and i don't think im ready to go that far in depth with every model here, no offense of course, they are great looking, don't get me wrong, but i just don't have that kind of time to scale all of the models here to fit into blockland for everybody.
so i guess it comes down to, i could do it, but it would take an amount of fiddling with, that i am not willing to undertake at this time.
however if you made like a "whats you favorite weapon model" poll, i bet i could export the top 3-5 for ya :D