This video tests an Attwood 15lb mushroom anchor's resistance to firearm impacts. Lower calibers like Birdshot, .22 LR, .380 ACP, and 9mm caused minimal damage, only removing the zinc coating or leaving minor marks. A 7.62x39mm round from an AK caused a slight dent. The .308 Win from a Diamondback AR-10 successfully impacted the cast iron, tearing out a chunk, but did not penetrate the anchor, leading to the conclusion that it is effectively bulletproof against these tested rounds.
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