Rise Armament Super Sporting Trigger, Live Free or Die, Curved Trigger, Anodized Finish, Black and White, Includes Anti-Walk Pins RA-140-LFOD-AWP There are many vital components in an AR. Items like bolt-carrier groups, upper receivers, and handguards all play a role. They come together to form one of the most popular firearm platforms in the U.S. But of all the parts and pieces, only one offers a direct interface between the gun and you: The trigger. This unsung hero sitting inside the lower receiver is the start of every fired shot.