Thanks all for the encouragement. I want to build a rifle that is a good mid-range shooter. Since I have the matched lower and upper my concern is finding the right parts that mesh well with the SI-Defense lower/upper. My gun shop carrier CMMG trigger kits, also Timney (but that will need some additional parts even though its a drop-in kit). Need carrier bolt assy., barrel, etc. Hoping someone out there has done an SI-Defense .308 build and can make some good recos. Much appreciated.