Like hoovco, I'm a big fan of the A2 birdcage, it's the best compromise and best price. Only costs ten bucks yet good flash suppression, low noise and isn't horrible as a brake.
You want to be sure the barrel actually is 14.7" because if it's any shorter then the A2 won't be long enough to reach a legal overall 16.01".
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek