WMD Guns Upper Assembly Billet 6.5 Creedmoor MLOK HG 15in 20in Barrel NiB-X Nickel. With the remarkable cooling system heat sync and locking potential that the billet provides this 15" M-LOK system allows you to create a long lasting and stable shooting platform. Additionally the handguard that comes with the assembly features a one piece oversized heat shield that creates a larger overall sight picture and also aids in redirecting the heat away from the shooter's eye away from the bore which is a major concern with cold weather shooting. Also due to the material the heat is transferred more efficiently through the handguard vs. the traditional heat sync system. Specifications for WMD Guns 6.5 Creedmoor Billet Upper Assembly w/ M-LOK Handguard: Manufacturer: WMD Guns Color: Nickel Finish: NiB-X Caliber: 6.5mm Creedmoor Gun Make: AR Platform Gun Model: AR-15 Handguard Type: Free-Float Handguard Length: 15 in Barrel Length: 15 in Package Contents: WMD Guns 6.5 Creedmoor Billet Upper Assembly w/ M-LOK Handguard What firearm models does the manufacturer say WMD Guns 6.5 Creedmoor Billet Upper Assembly w/ M-LOK Handguard is compatible with? The manufacturer suggests that WMD Guns 6.5 Creedmoor Billet Upper Assembly w/ M-LOK Handguard is compatible with AR-15WMD Guns 1-NIBXUA65CM: Upper Assembly Billet 6.5 Creedmoor MLOK HG 15in 20in Barrel NiB-X Nickel