Bearing surface contact varies from rifle to rifle, and the percentage of contact doesn't always correlate with accuracy.

Muramatsu converts a mauser to .45 ACP in this two-part series.

With a little imagination and a lot of skill, you can create a .45 ACP Mauser rifle. It doesn't matter why. This project is just plain fun.

Installing a new trigger in the AR-15 can make a world of difference.  Several companies make great aftermarket triggers. Let’s look at some.

Part 2 of how-to install a new trigger in the AR-15 and how it can make a world of difference. 

In order to launch projectiles with a high degree of precision and accuracy, the lock, stock, and barrel must work together in a complementary way. This is a sample chapter on Ruger 10/22 custom barrels from the book Customize the Ruger 10/22.

You can have an accurate .22 autoloader even if you don't want a heavy rifle or don't want to spend a tub of money on a heavy custom barrel. This sample chapter from Gun Digest Research shows you how.