I want to help build an AR10 in .308 for a friend. I've built several AR 15's in pistol and rifle in .223 and .300BO. Now I've got a buddy who wants me to put a really nice .308 together for him. I've asked a few questions here and got some great info. Here's where I am now. A Krieger 22" barrel is made. Krieger says they will only place a JP BCG on their stuff. OK. But, why would I want a low mass vs full mass BCG? My buddy has supplied his own upper and lower. These I'm told are DPMS clones. OK. So do I have a large frame? How do I tell? I've picked out a Gelssele 2 stage trigger. He wants to target and hunt. The first stage is 2.5# and 2# for the second. This seems to make sense. I want to build the brake. Though I'm not positive this is the best idea. The ones I've made have reduced recoil and enhanced accuracy but I do not know how they stack up to any of the myriad of brakes out there. Krieger mill matches the brake to the barrel. This looks great when I've done this. No crush washer. He has a stock, the lower kit. I've got a hand guard. The build is supposed to be right at $1,600. I'm really close. Thoughts?