I havn't read though all the post but im sure its been said, the DM's r all the same except for the look, size, weight, and profile. they never really changed alot. they r all nice. me personally i sold mine to get a legend. you dont have to lube O-rings all the time. The only difference between the DM's and the PM's is the PM's have no LPR. it makes them just a lil bit lighter i personally thing the PM4-5 look ugly and the 6-7 r hott as hell but like i said before i dont own one because of the lubing issue