The slug weapons should have a modular design system. I should be able to build a 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm round in short, intermediate, long, magnum, gauss, for a revolver, auto-pistol, Advanced Combat Pistol, SMG, bolt action rifle, self loading rifle...