You have my respect. I personally have a .22 rifle and two .22 pistols. One of the pistols is for competition. I've also got a 20 guage shotgun and a 12 gauge shotgun. Planing on buying an AR 15 that shoots 9mm instead of .556. Also planning on getting a mini 14 ranch rifle too. Something to keep in mind though, guns are only dangerous if you make them dangerous.
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Why would you want a .556 rifle to shoot 9mm? I mean that as a serious question. If your rifle is barreled for .556 then it should also be able to fire .223. When the zombie apocalypse happens id rather have a rifle that can cycle two types of ammo. Lol.