Patrick Sweeney is an American gunsmith

Gunsmith

A gunsmith is a person who repairs, modifies, designs, or builds firearms. This occupation is different from an armorer. The armorer primarily maintains weapons and limited repairs involving parts replacement and possibly work involving accurization...

 (retired), originally from Detroit, Michigan

Detroit, Michigan

Detroit is the major city among the primary cultural, financial, and transportation centers in the Metro Detroit area, a region of 5.2 million people. As the seat of Wayne County, the city of Detroit is the largest city in the U.S. state of Michigan and serves as a major port on the Detroit River...

. According to an interview with Shotgun World magazine, he is a well-known author

Author

An author is broadly defined as "the person who originates or gives existence to anything" and that authorship determines responsibility for what is created. Narrowly defined, an author is the originator of any written work.-Legal significance:...

 in the field of gunsmithing. Retired from gunsmithing, his writes full-time. He teaches law enforcement classes on the patrol rifle, and gunsmithing the AR-15.

In addition to writing books, he is the Handguns Editor of Guns & Ammo magazine.