Our in-stock Valkyrie slides are machined from Single billet 17-4 stainless steel and are made with tight tolerances increasing accuracy and performance. These are designed for the 43, 43X, and the 48. Easily convert your 48 to a 43X or upgrade your 43/43X to an Optics-ready platform. The come cut for the standard RMSc or 507K with proper forward lugs and 6-32 screws, and come with a matching cover plate. These come in 5 colors but if you email us with a special request, we’ll accommodate. We strongly encourage only OEM slide internals used as there are countless poorly-made Chinese offerings that have no place in a slide of this quality. All products made here in the US.