Andro Corp Industries Front Sight Base SB AR-15 5.56mm Threaded Rifle Barrel 10.3 inch 1-7 Twist 1/2x28 QPQ Corrosion Resistant Black. 3 FSB BARREL for your MK18 Clone build? This is your barrel Machined from 4150 CMV Steel. Melonite QPQ coating. A fast 1/7 twist to handle the heavier grained ammunition. And to run suppressed an .070 gas port. Perfect for your build. We also offer the crane spec barrel with the Front Sight Base. This AR15 10.3 FSB BARREL CRANE SPEC .070 GAS PORT FSB is specifically designed to be ran in conjunction with a silencer. This barrel does not come with front sight parts or sling swivel installed (must purchase separately). Specifications for Andro Corp Industries Front Sight Base AR-15 5.56mm Threaded Rifle Barrel: Manufacturer: Andro Corp Industries Color: Black Finish: QPQ Corrosion Resistant Fabric/Material: 4150 CMV Melonite Caliber: 5.56mm Barrel Length: 10.3 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Gun Make: AR Platform Gun Model: AR-15 Features of Andro Corp Industries Front Sight Base AR-15 5.56mm Threaded Rifle Barrel: Pinned F-Mark Front Sight Base Carbine Gas Gas Port Size .070 QPQ M4 Feed Ramps Extension Package Contents: Andro Corp Industries Front Sight Base AR-15 5.56mm Threaded Rifle Barrel What firearm models does the manufacturer say Andro Corp Industries Front Sight Base AR-15 5.56mm Threaded Rifle Barrel is compatible with? The manufacturer suggests that Andro Corp Industries Front Sight Base AR-15 5.56mm Threaded Rifle Barrel is compatible with AR-15Andro Corp Industries B556103CSFSB: FSB AR-15 5.56mm Threaded Rifle Barrel 10.3 inch 1-7 Twist 1/2x28 QPQ Corrosion Resistant Black