AR-15 Hammer

AR-15 Hammer
AR-15 Hammers.  Most lower receivers are made for Mil-Spec parts however there are some receivers that were made by Colt that require a larger Hammer and trigger pin.  The standard Mil-Spec is .154 Diameter.  The Colt type receivers sometimes used the .170 Diameter pins. 

AR-15 Hammer with "J" Pin for small pin lower receivers

AR-15 Hammer with "J" Pin for small pin lower receivers

AR-15 Hammer spring

AR-15 Hammer spring