Understanding Headspace: Unlocking the Secrets for Safe and Accurate Shooting

By Brady Kirkpatirick Introduction If you’re in the world of firearms, you’ve likely heard the term ‘headspace.’ But what is it, and why is it so vital? My name is Brady Kirkpatrick, the founder of GunMade.com, and I’ve spent years delving into the intricacies of firearms, including the concept of headspace. In the simplest terms,… Read more »

4th Book in the “Gunsmithing Student Handbook Series” is Now in Print!

Being in the gun business for almost 40 years now I have become acutely aware if the lack of basics being taught in schools.  In particular in Occupational Trades institutions. Before you send me a nasty gram defending your favorite school keep in mind I teach at one of these colleges and have friends at… Read more »

After Market Pistol Barrels

In 2018 a new condition became obvious to us here at 4D Reamer Rentals LTD. In the past we saw certain reamers receive damage because of aftermarket cylinders out of Russia or China.  They were hardened by the maker to the point that only Carbide tooling could be used on them successfully.  We had clients… Read more »

P.O. Ackley

Ackley Category Added to the Site

We have seen a ton of demand for Ackley calibers since the publication of Fred Zeglin’s two new books in 2017.  For this reason we have created a category on the 4D web site to separate out all Ackley cartridges making them easier to find.  They still appear in the standard caliber listings as well…. Read more »

Gunsmithing Student Handbook Series

Fred Zeglin released two titles in his new series of instructional books for anyone who wants to understand how guns work.  Tailored to students of gunsmithing, whether you are a hobbyist or a professional Zeglin bring over 3 decades of gunsmithing and teaching to the table.  These books are clear and concise detailing specific subjects. Lee… Read more »