24" is fine.
Unless you are trained in house clearing and have a buddy or three backing you up, I believe your chances of surviving an actual encounter with armed assailants in your home is best if you hunker down and let them come to you. Personally, I will have a king size bed between me and the bedroom door I'll be covering with a 12 gauge. The wife will be on the floor beside me talking to the 911 operator using her cell phone.
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Proud member of the NRA and Texas State Rifle Association. Registered and active voter.
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