Increased capacity of 8-rounds; Carbon Steel or 17-7 PH Stainless Steel tube; 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 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; Stainless Steel Finish