For one of many of the crazy projects in my head (one which to be honest I'll never likely actually do) I started thinking about different people's ring sizes. I regularly wear various rings, sometimes on all fingers and sometimes on just one or two. Put down all your fingers if you like, or...

I was just looking around at the "photos of your AR's" thread and I saw one lower receiver that said it was multi-caliber. Is a rifle capable of firing different caliber rounds, from the same barrel? If you can, what is the range of rounds and how could you figure this out. Im used to shotgun...

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In researching reflex sights for pistol or shotgun they mention the size of the dot seen through the window. Sample images are given showing the dot superimposed over a silhouette of a head & upper torso. My question is at what distance is the silhouette, 25, 50, 100 feet? I'm trying to...

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