9x39mm Basics with Piedmont Cartridge
This video explores the 9x39mm cartridge, a Russian round optimized for subsonic, suppressed use. It highlights how the 9x39mm is derived from a 7.62x39mm case necked up to 9mm, typically firing heavy 245-275 grain projectiles. The discussion covers the engineering challenges in adapting AR and AK platforms for this low-pressure round, particularly regarding gas systems and magazine compatibility, and compares its subsonic performance to .300 Blackout for applications like hog hunting.









