P365DG Reptile XP features: CNC milled compensator ports for gas control and compensator function without a threaded barrel Two more ports for use with our N365 Ported barrel providing additional gas control New carapace style forward top serrations for press check traction Norsso signature 3D dynamic side windows created from complex CNC surfacing Ergonomic forward and top serrations for easier press checks and slide racking Multifaceted contoured front and rear corners Compatible for 9mm applications Compatible with P365 3.1" length barrels only; P365XL 3.7" length barrels are not compatible. Threaded barrels are not compatible with this slide Specifications for Norsso N365DG Reptile XP Slide: Manufacturer: Norsso Gun Make: SIG Sauer Gun Model: SIG Sauer P365 XL, SIG Sauer P365 Caliber: 9mm Luger Optic Cut: Trijicon RMR Color: Black Length: 6.5 in Width: 1 in Height: 1.375 in Fabric/Material: Stainless Steel Features of Norsso N365DG Reptile XP Slide Optic mount thread pitch: M4 x 0.7 Cosmetic/Lighting Porting Compensated barrel ports (C pattern) Integrally compensated slide Package Contents: Norsso N365DG Reptile XP Slide What firearm models does the manufacturer say Norsso N365DG Reptile XP Slide is compatible with? The manufacturer says that Norsso N365DG Reptile XP Slide is compatible with SIG Sauer P365, SIG Sauer P365 XL