Norsso N365DG Reptile XP Slide Black. 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 XLNorsso N365DG-REP-XP-507K-BLK: N365DG Reptile XP Slide Black