Made of weapons grade aluminum, the Krytac TR113 rail system is the ultimate handguard upgrade for your AEG. It is strong, lightweight, and very comfortable to hold. The keymod design allows rails to be attached where needed while keeping the weight of the unit as low as possible. It has keymod rail slots at the 3, 6, and 9 o'clock positions, with a full standard 1913 Picatinny rail running along the entire 12 o'clock position. This handguard comes standard on the Krytac SPR AEG, but can be added to most m4 variants. It is attached to the barrel nut using two large hex screws.