Welcome to the forum. So you are building a Featureless OLL AR. Search on the threads and there are some good threads just on that and some with a lot of photos. The top CGN menu banner in blue has good links too.
As said, right now is expensive with the panic buys. You should over time get the parts you need to put it together properly, but if you want the good engineered and quality material parts, it's going to cost you right now so leave a little room in your budget.
"Just leave me alone, I know what to do." - Kimi Raikkonen
The moment the idea is admitted into society, that property is not as sacred as the laws of God, and that there is not a force of law and public justice to protect it, anarchy and tyranny commence.' and that `Property is surely a right of mankind as real as liberty.'
- John Adams