Alamo 15 Trigger: High-Performance AR-15 Trigger Upgrade Overview The Alamo 15 Trigger is a precision-engineered, high-performance trigger designed specifically for AR platforms chambered in .223/5.56. Developed by Thomas Allen Graves, the original inventor and patent holder of the positive displacement reset trigger, this trigger embodies over 40 years of research https://alamo15trigger34333.homewikia.com/11412262/alamo_15_trigger_high_performance_ar_15_trigger_upgrade