I'm gonna stop you right there, you just said an AR-15 is a high-powered rifle. It is obvious you don't know anything about guns and I shall ignore anything you say from this point on.
I've got a colt LE 6940 and LE 901-16S. First AR was the RRA entry tactical. It's a shame you had to get rid of you RRA. I kept it as my everyday shooter and gun I dress up. Enjoy your Colt!
It was not easy to sell the rra but I wanted to buy a flat top before November and this is the only way I could do it with out using my credit cards. I made a profit of $250 on the rra so it was not all bad... Do miss her, should have the colt some time this week.
Rain, snow or sleet.... Mud, sand and dirt.... My GLOCK will work ;)