Not top-tier kit, but for the price the value is excellent. I helped a guy in my ward put one together about a month ago. I was impressed it was only $39+shipping+Federal transfer fees.

http://www.aimsurplus.com/product.aspx?item=F1ANSLNTG&name=Anderson+Manufacturing+AM15+Multi.+Cal.+Lower+Receiver+w%2f+Trigger+Guard&groupid=722&utm_source=AIM+Surplus+Main+List&utm_campaign=0ce862ec83-04242015&utm_medium=email&utm_term=0_6870497a6a-0ce862ec83-18150917

[Disclaimer] have no interest in AIM Surplus or Anderson Arms, just passing along an excellent deal for those who would want to excersize their skills at building something and the right to keep and bear arms.