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Thank you for the input. I have much to learn. The references cited are a great start. All thoughts are welcome.

I have been reading the threads about rifles and have decided it is probably time to move towards an EBR. I suppose this could be a step towards increasing my defense options. I have hunting rifles and am familiar with rifle shooting, using scopes and have fired a pistol with the red/ green dot optics. I have never even held an AR type rifle and frankly need some basic education, starting with a basic explination of the various parts and their functions. I mean basic, like uppers, lowers, (barrel and stock I think I have the idea) and how the are put togther. Then I wonder about the 1:9 versus the 1:7 issue. I assume that refers to the twist rate on the barrel grooves. Does the barrel with more twists in it produce a greater rate of spin on the bullet and result in greater accuracy? And finally, what caliber is most widdely used? I ask this in the context of a worst case scenario and I am forced to scavenge ammunition, I would like to improve the odds of finding some.

Thanks in advance for your thoughts.