Unless you have all the paper work and background check to legally own a full auto firearm, the best trigger on a home defense weapon is one that allows only one round fired each time the trigger is pulled.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)