Hornady - Rapid Rack AR-10
Hornady developed the Rapid Rack empty chamber indicator and load assist device as an excellent way for those on patrol or in their home to keep their long gun ready with a fully charged magazine and an empty chamber. The product’s red lever handle visually displays an empty chamber, which is made ready in seconds by shouldering the gun and pulling the Rapid Rack lever straight back, simultaneously allowing it to fall to the ground while the firearm’s fully charged bolt springs forward to feed a round into the chamber.
Simply insert the cartridge-shaped portion of the Rapid Rack into the chamber leaving the colored lever protruding from the gun’s ejection port. Close the bolt and insert a loaded magazine (AR-15/10), or load the tubular magazine (select 12 gauge shotguns). The colored level visually displays an empty chamber. Grab the lever and pull straight back, allowing the Rapid Rack to fall to the ground so the fully charged bolt springs forward to feed a round into the chamber.