Features attractive CNC machined diamond checkered serrations that provide a positive gripping surface Custom machined top window port Slide machined hardened Stainless steel for long lasting performance Machined to accept Trijicon RMR, SRO or Holosun 507 red dot optics Compatible with Gen3 G21, G20 or P80 PF45 10MM frames Compatible with 10mm 3rd Gen G20 Slide Internals. QPQ Nitride finish Channel liner installed Professional gunsmith installation recommended. Mfg: Alpha Shooting Sports