The tiny parts in the frame and slide, including the takedown and slide halt levers, cause and mag launch, are all regular Glock black, as would be the four-inch Glock Marksman barrel. These things are usually marketed as being "post-sample" products to be used by federal firearm licensees for production/distributing https://elliotafjfr.shoutmyblog.com/30373140/a-review-of-rpk-for-sale