Norsso P365XL Reptile C Slide Black. 125 in Width: 1 in Height: 1.375 in Fabric/Material: Stainless Steel Features of Norsso P365XL Reptile C Slide Optic mount thread pitch: M4 x 0.7 Cosmetic/Lighting Porting Compensated barrel ports (C pattern) Package Contents: Norsso P365XL Reptile C Slide What firearm models does the manufacturer say Norsso P365XL Reptile C Slide is compatible with? The manufacturer says that Norsso P365XL Reptile C Slide is compatible with SIG Sauer P365 XLNorsso N365XL-REPCOMP-507K-BLK: P365XL Reptile C Slide Black