WWII Era 50 cal pen with armor piercing bullet

Some of you will recall my write up on a modified way to make 50 cal pens using 3D printed inserts and ball bullets

How many Newton's would the impact of a 50 BMG be? - Quora

Headstamp - Wikipedia

WW2 Armor - Now hear this! With multiple types of

What happens when a .50 caliber bullet hits a person? - Quora

Feeding WW2 U.S. .50 Cal. Browning Machine Guns: Part I - Small

Cartridge (firearms) - Wikipedia

Chris Mezzacappa on LinkedIn: The anatomy of a 20mm Semi-Armor

Armor Piercing Caliber .30 M 2

Would a .50 Cal Sniper bullet penetrate a tank's armor (e.g. an

Could a .50 caliber Browning penetrate German Mark 2 or 3 S armor

U.S Snipers - Military cartridge types.. The .50 BMG cartridge