New to this site just stumbled across it . I like it!!! Anyway i just built a 308 AR. DPMS Upper , slick sided, 18" bull barrel mated to a CMMG MK3 Lower. Got everything together, the mags(DPMS) fit, rifle seems to be fine, however due to the lack of a forward assist, loading a round seemed to be hard, not like the AR 15s i Have built in the past. I did not have the upper milled for the g-3 mags, not sure what they are German or something. Any suggestions, the mags are 20 rounds, it seemed to load better with a few round out of the mag. I hope to shoot it soon, but gotta get the boat ready for charter season. Any input would be very very helpful. also I did buy some rounds that were on sale from cabelas. remans i think , they could be an issue. JW