LWRC ICDIU3CK16 ICDI Direct Impingement .300 Blackout 16.1" 1:7" 5/8x24 Bbl FDE Complete Upper ReceiverThe LWRC ICDI Direct Impingement .300 Blackout 16.1" Complete Upper Receiver ICDIU3CK16 is a high-performance, pre-assembled upper for the AR-15 platform chambered in .300 Blackout. It features a 16.1-inch barrel with a 1:7 twist rate, optimized for subsonic and supersonic .300 Blackout ammunition. The barrel is threaded 5/8x24, compatible with most muzzle devices. This LWRC ICDIU3CK16 upper utilizes a direct impingement gas system for traditional operation while maintaining LWRC's commitment to durability and reliability. Finished in Flat Dark Earth (FDE), it offers both a rugged aesthetic and superior performance in various tactical and precision applications. LWRC ICDI Direct Impingement .300 Blackout 16.1" 1:7" 5/8x24 Bbl FDE Complete Upper Receiver ICDIU3CK16