This isn't a full build, as I bought the upper complete and only built the lower. This is my first build outside the .223/5.56 realm, so I learned a few things I didn't know before. I used a CMMG MK-3 lower. It accepts DPMS pattern uppers and mags, and will use a DPMS parts kit as well. It turns out that in the DPMS based .308 world at least, most of the lower parts are the same as the AR15 parts. The only differences are the takedown pins, the bolt catch, and the bolt catch pin. So I didn't take pictures of the parts that are the same as the AR15, since there are plenty of good write ups on that already. So, without more babbling from me, here are the different points or things I found interesting. 1. Threaded bolt catch pin. I love this. I hate pounding the roll pin into a brand new receiver, this is much better. 2. Semi-captured detent pin. This made putting the pivot pin together a snap. 3. Takedown pin spring and safety selector spring both retained by grip.