This video details a rigorous mud test on a $399 Palmetto State Armory (PSA) M4 clone, demonstrating its surprising reliability. Instructor Karl Kasarda subjected the rifle to extreme mud conditions, including direct application into the ejection port with the dust cover open. The PSA M4 clone, chambered in 5.56x45mm NATO, successfully fired multiple magazines under these harsh conditions, highlighting the robustness of the AR-15 platform's direct impingement system even in budget-friendly models.
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