I stepped into my local gun store and he had a XM15 E2S 16" A3 in EXCELLENT condition. Maybe 200 rounds through it. I paid $630+tax for it, and I feel it is a fair price. What do you guys think? They also give me a parts/labor lifetime warranty on the gun(This store has been there 50 years, so chances are they are not going anywhere anytime soon). A far as inspecting it further, I've read about using a bore scope. Is this a reliable way to check the bore, also what else can I look for to check the wear/tear on the gun? Any other means to check out the gun?