The Hybrid M134D-H Gatling Gun is the latest offering from Dillon Aero.  It is a combination of the steel parts from the original M134D gun and mixed with parts from the M134G-T titanium gun to get a combination of weight savings and long life.  This new gun weighs 43.5 pounds and is only 2 pounds heavier than the titanium gun and has a service life of one million rounds. The Dillon guns are in service with the US Armed Forces and in the British Navy.

pic of Dillon Minigun

The original GAU-2 (M134) minigun from the 60's was about to be retired untill Dillon improved the functioning and reliability of the weapon.  Almost every component has been redesigned and now replaces the original gun in U.S. service.