Cost effective - AIM Sports Inc Mid-Length AR Free Float Quad Rail Mount

I knew next to nothing about ar's but after a little research and common sense I found it extremely simple and easy to do provided you have the right tools. You will need an armorer's tool/barrel nut wrench and a vice to equip this rail. I've heard complaints about the barrel nut being aluminum. I don't really see the problem. For the price, it's definitely a nice rail for a budget build and would absolutely recommend it to someone else looking to upgrade their ar on a budget.