>>If I was intent on invading someone's home and they did the Biden maneuver, yes I'd bet my life on my knowledge. I'm more than a little familiar with firearms.
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>>The sound is an additional giveaway on the type of weapon. Obviously you are at the level of Jean on weapons knowledge.
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>Believe me, a sawed off shotgun filled with only birdshot works perfectly when faced with a home invasion (one shot). The only after effect is repairing the wall. :) The other weapons (which were within arm's reach) were never needed. It's my preferred 1st line of home defense weapon. The others are for practice, target shooting, and real use.
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>I do know someone who had a door brace (I do too on all doors - it's enough to slow them down but not stop them) and used an iron skillet to knock the intruder out. Whatever it takes.

A 4" cast iron skillet is a multi-purpose tool. You can cook with it, tenderize meat with it AND use it as a weapon.