The Glock 20 Gen 4 is a 10mm powerhouse pistol, originally designed in 1991 to handle the potent 10mm cartridge. Its polymer frame and 15+1 capacity make it suitable for hunting, trail protection, and self-defense, offering significant stopping power. The Gen 4 features modular backstraps for grip customization and a Safe Action trigger system, with a hammer-forged barrel requiring jacketed ammunition.
This ballistic gel test compares 10mm and .357 Magnum calibers using Underwood Ammo. The .357 Magnum 158gr achieved deep penetration (25.5"), while the 125gr fragmented early (17"). The 10mm 200gr offered consistent performance (22.5"), and the 150gr fragmented similarly to the .357 Mag 125gr (17.5"). Bullet recovery showed varying weight retention and expansion across all tested loads.
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