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 Gen 1-3 Glocks but are easily compatible with Gen 4 slides with a simple lug adapter and Gen 3 guide rod sold by various manufacturers. These come in 3 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. Our RMR Optic cuts utilize forward recoil lugs and are drilled/tapped for 6-32 tpi. These are compatible with nearly all aftermarket Red Dot optics which share the RMR/SRO footprint. These come stripped with cover plate. All products made here in the US.