in Feb.2012, I bought the CORE15 M4 16" Flat Top - Gas..... It was my first AR. Walked out the door of my dealer for $790 inc. Tax, title & License...lol I Had a Bushmaster, DPMS & a RRA laying on the counter when he showed me this rifle. I put it in my hands and fell in love with it. It was $100 more than the DPMS and Bushmaster and $50 less than the RRA. I picked the CORE15 and took it home.. Dropped AIMSPORTS quadrails on her.. Leppers Mil-Dot Gen5 Optic & UTG 150 Lumen Light & Laser with a UTG combat foregrip, coi-tech bungee single point sling.. I have ran about 1000 rnds out of her so far, Brass, Steel Case, FMJ, HP, SP, BTHP.... zero malfunctions. I did put a BCM extractor upgrade in the BCG immediately before firing it. I am extremely happy with my purchase, everyone who has fired it is very impressed with its accuracy and smothness and how well built the rifle is. KUDOS to Core15. I will continue to purchase Full Builds from CORE 15