So I was browsing gunbroker for a preban colt AR15 and came across this sporter. I was originally only looking for a lower but I am thinking buying a complete rifle might be worth the extra $$. My stipulations are: fenced lower, 16" barrel, Colt or Olympic Arms. I would like a flat top upper but that seems almost impossible to find. http://www.gunbroker.com/Auction/ViewItem.aspx?Item=153406426 I figure I can buy this and have a good baseline preban Colt AR then once I know what I like/dislike I can build a super evil upper and toss it on there keeping the original parts just incase I ever want to go back to stock/sell it. Ideas?