First I want to say I from Ohio, I am new to the forum as well I am starting my first AR style 308. My awesome wife got me a stripped POF P308 lower for Christmas. I plan on staying with POF for my lower parts, but really like Wilson Combat 3g trigger (hoping it will fit a 308) I alsolkke fbe Vltor stock they are using. What I am debating over is what upper to go with. Stay with POF, go with DPMS, or Rock River? I have heard many many things just ti the week I have started looking. Like I have to stay with the same manufacture for upper and lower (finding out this is not true) also is it better to go gas piston or direct gas? The tech at POF is telling me the 308 is really difficult to build from the ground up. Issues with feeding, jamming, ejecting, and accuracy. Please any suggestions and any books reference materials would be greatly appreciated. thanks for ready and sorry for being long winded.