Fred Zeglin

Fred Zeglin retired from building custom rifles after 30 plus years and specialized in wildcat designs for his clients. He still dabbles in wildcats for fun. In 2005 his first book was published, “Wildcat Cartridges”.

In 2024 the second edition of that book was published by Gun Digest. Fred has written six more books including “P.O. Ackley, America’s Gunsmith”.

Fred Spent many years as the Firearms Technology Coordinator and the Short Term Gunsmithing Program Coordinator for Flathead Valley Community College in Kalispell, MT. He wrote and implemented the curriculum for the firearms program at the college and still serves in an advisory capacity for the program. He currently owns 4D Reamer Rentals Ltd. so he deals with more reamers and headspace gauges than any other gunsmith you will ever meet.

Fred has taught NRA Gunsmithing courses in Wildcat Cartridge Design at Murray State College in Oklahoma, Flathead Valley Community College in Montana and Trinidad State Junior College in Colorado. 

Fred also worked with AGI to create a Wildcat Cartridge lesson and Reloading instruction on DVD. Fred has written articles for Precision Shooting Magazine, Guns and Ammo, and many others.

He assisted with “Cartridges of the World” 16th edition from Gun Digest. And in 2020 he updated the “Gun Digest Book of Exploded Gun Drawings”, 4th edition. In 2023 Fred wrote the second edition of his Wildcat Cartride book for Gun Digest, which they will publish in 2024.

Fred is writing and editing the “Gunsmithing Student Handbook Series”. Titles include:  Understanding Headspace, Chambering for Ackley Cartridges, Chambering Rifle Barrels for Accuracy and Gunsmith Tools, Cutters & Gauges, A-Primer. Look for other books in the:   “Gunsmithing Student Handbook Series” coming in the near future. Visit:

Fred also writes a gunsmithing blog, that can be found at: