This 5.56 was built by one of the guys here. He had a long list of all of the upgrades. Barrel is rated at 30,000 rounds, smooth as glass bolt carrier (it looks triangular). I paid $750 and then added the Magpul sights, Magpul grip, Magpul vertical grip, and extended the charging handle. For one, I don't like that the key mod is almost as long as the barrel. The entire rifle is kind of plain. I hate to give away a great rifle (accurate and reliable), but I want it to look sharp. Suggestions for upgrading? Color change? Thanks for your help!