The Ultimate Guide to the Heckler & Koch HK416 Rifle
https://defensebridge.com/article/the-ultimate-guide-to-the-heckler-koch-hk416-rifle.html
webMar 22, 2023 · The M4 carbine, a shorter and lighter variant of the M16 rifle, uses a direct impingement gas system, which directs hot gas from the fired cartridge directly into the receiver to cycle the action. While this system is simple and lightweight, it can cause reliability issues in harsh environments, leading to fouling and parts wear.
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