Extremely lightweight” suppressor compatible and infinitely adaptable because of its M-LOK accessory attachment system” the Seekins Modular Combat Suppressor Rail Version 2 is perfect for tactical or competition use. Precision machined from 6061-T6 aluminum” it features a seamless top picatinny rail and M-LOK slots at the 3″ 6 and 9 o’clock positions for solid mounting of accessories where needed. This handguard is designed fit over a sound suppressor” with a generous 1.8″ inside diameter. Includes barrel nut and mounting hardware.