Black Rain Ordnance Upgrade Kit AR-15 Handguards Black. Features a 12 inch Hybrid MLOK rail with mounting hardware a 5.56 precision hex compensator with crush washer .750 adjustable gas block and a lasered dust cover. Specifications for Black Rain Ordnance Upgrade Kit AR-15 Handguards: Manufacturer: Black Rain Ordnance Color: Black Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Handguard Length: 12 in Handguard Style: Hybrid Rail Gun Rail: M-LOK Features of Black Rain Ordnance Upgrade Kit: 5.56 precision hex compensator w/ crush washer AR-15 dust cover 12" hybrid MLOK rail w/ mounting hardware .750 adustable gas glock Package Contents: Black Rain Ordnance Upgrade Kit AR-15 Handguards Black Rain Ordnance BRO-UPUK: Upgrade Kit AR-15 Handguards Black