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The Echo AR II Trigger from FosTech Outdoors is an ATF–approved rifle trigger built specifically for AR 15 platform weapons. These Rifle Triggers feature an innovative drop-in design for easy installation, and deliver crisp, light pulls while in semi-auto mode. Overall, the Fostech Echo Trigger has 3 different modes: safe (firearm will not fire), semi-auto (gun fires when trigger is pulled), and echo (weapon fires when trigger is pulled and released). These drop–in AR 15 triggers require a full-auto bolt carrier to function properly, and bolt carriers are not included with purchase.