A lower parts kit is a collection of components that can be installed in an AR-15-style rifle to convert it from a semi-automatic configuration to a fully automatic configuration. The kit includes the full auto fire control group, as well as a new hammer and disconnector.
Installing a lower parts kit will effectively turn your AR-15 into an illegal machine gun, and should only be attempted by qualified professionals. Doing so without adequate training could result in serious injury or death.
Natalee Answered question August 26, 2022