This video conducts a concrete penetration test comparing the AR-15 (chambered in 5.56x45mm) and the AK-47 (chambered in 7.62x39mm). The test utilizes 100lb concrete slabs within 5-gallon buckets. The results indicate that the 7.62x39mm caliber is significantly more effective at penetrating hard barriers like concrete compared to the 5.56x45mm caliber.
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