This is a slide from a Para Ordnance P16-40. It takes a 5 inch barrel with a Clark Style Ramp if used with a Para Ordnance frame. On a Colt or aftermarket frame you can run Colt Delta Elite 10mm barrels This would be excellent for a Frankenstein project gun build in either .40S&W or 10mm. The slide has a black epoxy or powder coating. It also has the Colt style Series 80 firing pin safety. Included are the extractor, the firing pin, the firing pin spring, the Series 80 firing pin lock parts, and the firing pin stop, all stock Para Ordnance components. Very few rounds were fired thru this unit.