Well i finally broke down and purchased my 1st AR15 this is a far cry from my LeverActions and just a wee bit intimidating hence I've read the manual twice already. My question would be about ammo selection. What is a good range ammo and God forbid what is a good defense ammo. The firearm is a Colt 1/7 twist barrel marked 5.56. Any and all comments are welcome to help this clueless guy out .... LOL