I have a DPMS AR10, .308 16". Runs fine, won't shoot straight. Only accurate with 125/130 bullets. I have run the gambut of suitable powders and bulets in 150 and 180 and get 3 inches at best at 100. Sent back to DPMS. They said there is nothing wrong with the rifle as it shoots 130 grainers under an inch that spraying 150 and up is just quirky for that rifle and they won't replace the barrel. The twist is 1:10, most .308 barrels run 1:12. Where can I get a barrel installed, 1:12, say an 18 inch tube so I can keep all the handgaurd parts? By they way. Since I've had mine I've been doing a lot of reading on DMPS and lots of shooters are having a host of problems with them. Mostly accuracy issues but a lot are rifles that won't run. All sorts of jaming issues. If I can't get a good barrel installed I'm going to take the whipping in cash and sell the thing.