Did you buy it at a local gun store or on the internet? If on the internet, can you post a link of the one you purchased? Also, which brand is the best one to get? I have heard that Colt, Bushmaster, Rock River Arms are quality guns. Any help here will be much appreciated.
Thanks.
You won't do bad with any of the above manufacturers. I own all three, and think all three are great. The specifications that you want for your rifle are the most important considerations when determining which brand to go with. Some brands offer more options than others. For example, Colt makes one of the best rifles out there, but Bushmaster and Rock River offer many more options and configurations.
Figure out what barrel length(14.5, 16, 20, etc), profile (HBar, Govt, lightweight, etc), twist rate (1/9, 1/7, etc), lining (chrome lined, non-chrome lined), and gas system (rifle, carbine, midlength) you want. What kind of upper receiver (A1, A2, A3). What kind of feed ramps. What kind of stock (A2, A1, Milspec collapsable, Comercial collapsable).
If you don't know what all of these options are, then school yourself before you drop +/- $1000.
When determining where to buy, find the place with the best deal. Just remember that if you order off the internet, you will have to pay shipping and do a transfer through a FFL which usually costs around $20.
If you decide to buy at a gun shop or gun show, make sure you know exactly what you want. NEVER let some guy in a gun shop try to sell you something other than exactly what you want. For some reason, the AR-15 is one of the most BSed about guns there is. Gun shop dealers are notorious for feeding people BS stories about how great some junk AR they have on the shelf is, and the story usually has some reference to an elite military unit. Remember that they are just like car salesmen. All they want is a sale.