Carbon Steel tube, heat-treated for strength. Internal components are linked together to offer easy disassembly and reassembly. Lubricated nylon polymer follower with metal insert where the slide stop activates properly aligns all types of ammunition for the most reliable feeding. Spring is manufactured from from higher tensile music wire with a drawn phosphate coating for easier coiling properties and longer service life. Redesigned high impact polymer removable butt-plate is tapered to to fit funneled mag wells.