Worrying about Dicks is a waste of time, wander into your local gun shop and ask to see an AR rifle. They’ll ask what caliber, gas operated or piston, standard forearm, or free float. Etc etc. A little dick in an ocean full of real dealers. Conserve your energy and money, all Dick’s was ever good for (a question in it’s self) was tennis shoes.
I built my own ARs.