Fenix Lighting Barrel Mount Black. With no extra tools necessary attach the mount to any gun barrel that is 18-23mm in diameter for a secure fit. For use with most of Fenix flashlights that have a body diameter of 23.5-28mm. Note: If the Fenix ALG-18 Barrel Mount is used on a barrel with high volume rounds the heat of the barrel will require you to remove the rubber cushions before using to avoid the rubber from melting. Specifications for Fenix Lighting ALG-18 Barrel Mount: Manufacturer: Fenix Lighting Flashlight Application: Casual Outdoor Fabric/Material: 6061-T6 Aluminum Color: Black Finish: Hard Anodized Features of Fenix Lighting ALG-18 Barrel Mount Tool-free assembly and disassembly Fits weapon barrel with diameters of 18mm-23mm Compatible with flashlight body diameters of 23.5-28mm and a head less than 70mm including C7 E-CP E28R E35R HT18 HT30R LD30 RENEGADE PD32 V2.0 PD35 V3.0 PD36R PD36R PD36R PRO PD36 TAC PD40R V2.0 TK16 V2.0 TK20R V2.0 TK22 TAC TK25R TK26R TK30 WF26R Package Contents: Fenix Lighting ALG-18 Barrel Mount Fenix Lighting ALG-18: ALG-18 Barrel Mount Black