The MIL LOC is the military/LE version of the quick pins. Utilizing the same patent pending technology as the quick pins The MIL LOC expands inside of the upper receiver pulling it tight against the lower receiver and aligns the bolt carrier group with the buffer tube which improve accuracy, reliability and function of the firearm. Using an empty brass 5.56 case operators can quickly remove the pin when field stripping and re-install even when wearing gloves.