Norsso N365XL 3.7 in 9mm Ported Barrel Satin Stainless LVL1.5 Silver. Two diagonally positioned ports that provide compensator functionality without the use of a threaded barrel and attachment. Fully supported chamber to reduce case bulging and blowout risk. Trimmed and crowned front muzzle profile. Prevents corrosive primer gas spray on optic by excluding the Loaded Chamber Indicator Slot Specifications for Norsso N365XL 3.7 in 9mm Ported Barrel: Manufacturer: Norsso Color: Stainless Steel Finish: Satin Fabric/Material: 17-4 Stainless Steel Caliber: 9mm Luger Gun Make: SIG Sauer Gun Model: SIG Sauer P365 X-Macro SIG Sauer P365 XL Barrel Length: 3.7 in Barrel Twist Rate: 1-10 Flutes: No Weight: 2.8 oz Features of Norsso N365XL 3.7 in 9mm Ported Barrel No LCI Slot Top Chamber design No fluting C Style Ports Rifling: 1:10 RH Package Contents: Norsso N365XL 3.7 in 9mm Ported Barrel What firearm models does the manufacturer say Norsso N365XL 3.7 in 9mm Ported Barrel is compatible with? The manufacturer says that Norsso N365XL 3.7 in 9mm Ported Barrel is compatible with SIG Sauer P365 XL SIG Sauer P365 X-MacroNorsso N365XL-PBRL-9MM-SSS-LVL1.5: N365XL 3.7 in 9mm Ported Barrel Satin Stainless LVL1.5 Silver