I just purchased an Armalite brand rifle at the LGS. It was marked and priced as a used DSR 10. I looked it over and decided to buy it as it was well fitted and th Real AR-10! I checked it over more closely at home. I found a 2 stage trigger and squared base for magwell. I contacted Armalite by e-mail and sure enough I have a used AR -10A4 CBF. Made in 2011. I need to use the Armalite brand mags, but it is a really nice rifle. I can't wait to spend a bit of range time with it. All for sub $800.00. I am pleasedso so far. MK