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

Can you destroy a tank with a .50 caliber rifle? - Quora

50 Cal Bullet Pen Kits, Pen Kits

Out of curiosity, what is the maximum armor penetration 50 cals

Can armor piercing 0.50 cal penetrate the armor of a Stryker? - Quora

Cartridge (firearms) - Wikipedia

50 Caliber Armor Piercing Incendiary Bullet, 1944 - Bullet, Armor

WW2 Armor - Now hear this! With multiple types of

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

Congress Proposes Gun Control Legislation Broadening Meaning of

WWII 50 Caliber Headstamps