The Expo Arms AR-15 Enhanced Handguard features one of the most durable barrel nut locking mechanisms on the market. The wedge lock design provides a greater surface area for keeping the handguard attached to the longer barrel nut and significantly reduces the chance of the handguard from twisting or coming loose. In addition to this enhanced attachment method, the handguard is machined from thick 6061-T6 aluminum with alternating M-LOK slots that increase rigidity while still giving you plenty of options for setting up your rifle with whatever accessories you need.