Walked in the local shop and picked it up. Couple questions: How can you tell the type of barrel (Bull, etc.)? The hand-guards are not what is in the manual. They are made by Troy Mfg. and are bolted on. Not a big deal to me, but why would the manual not have this in it? Anyone have any pro's and con's? This is my first AR, and it does feel good in my hands. I haven't had a chance to shoot it yet, hopefully this weekend.. I appreciate any advice.