Hey guys, I am going to build an upper for my AR. Now this will be my first upper build so I will be asking for a lot of help in the meantime. First the upper I am looking at is the PSA upper. http://palmettostatearmory.com/inde.../upper-receivers/complete-upper-receiver.html The barrel I was looking at is the Spike's 16" cold hammer forged mid length gas, and its chrome lined. It's also MP and HP tested. http://www.brownells.com/.aspx/pid=45463/Product/AR-15-M16-FN-COLD-HAMMER-FORGED-BARRELS If you guys have any recomendations or suggestions or something else I should look at, please let me know. I will ask for suggestions on the other parts later.