I would HIGHLY recommend an Armalite Barrel set up. Bushys are very good as well, but as of lately their quality control has been a bit, well, on the light side. There are several posts on here lately about the front site post not being indexed properly, making it necessary to run your rear site all the way to the right to get on paper. This seams to be a problem mainly with parts ordered rather than complete weapons. I personally know of 4 complete uppers that were purchased ( 2 mine ) that had to be sent back due to repairs needed for this. My two uppers were bought a year apart and had the same issue. the other two were a friends.
I have had and have 2 Armalites now that were built up the same way and never had a problem with them. I truely Believe they have better quality control. However you will wait most likely for one. 4-6 weeks right now Im told. BUT I happen to know that there is a shipment of barrels, uppers, and rifles coming in real soon I believe. you may be able to get in on it if you call them.
Just my $.02, dont want to offend any bushy owners, Im one 2.
cp