Gentlemen;
AR 10 is a copyrighted name for .308 autoloading rifle made by the Armalite corporation.
A similar rifle by any other name is NOT an AR10 and the Armalite fanboys will be quick to remind you of that.
The original AR design rifle by Gene Stoner was in fact a .308 rifle. The military decided to downsize the cartridge to the (now) 5.56 round. Gene Stoner redesigned the rifle and it became the AR 15. Colt bought the manufacturing rights to the AR15 & we went from there.
In .308 AR style rifles, there are Armalite AR 10s and all other manufacturers. All that said, DPMS makes a very accurate and reliable .308 rifle called the LR 308. It comes in various configurations and price levels. It is different from Armalites offering and many, if not most, parts will not interchange between the two, but the DPMS and the other non Armalite offerings are usually pretty much interchangeable.
The DPMS design has far more options and accessories available especially magazines.
The Armalite rifle is well respected and is regarded as a high quality rifle with a price to match. Its design is the original, based around a modified M14 magazine, which has long been viewed as its achilles heel. The other manufacturers are viewed as being not as well constructed as the Armalite but in truth, the differences are small and in real world use of little concern.
Truth be told up front: I have owned a DPMS LR308B for over 5 years with many thousands of rounds downrange. It has NEVER failed, jammed, quit, broken or caused ANY problems. It is also accurate, as in consistently sub moa with decent ammo. My rifle is not unique as a lot of folks now own them and enjoy the same reliability and accuracy.
10 rds, 42.5 gr RE15, 168 Sierra HPBT M.
Roger