I prefer shorter mags in the Ruger PC. I do not need 33 rds,(i own one) since the apocalypses is not on the horizon. I like the short mags because it makes the carbine easier to maneuver, handle, bench etc. The 17's work just fine OEM or Magpul. I had a "drum" magazine for my AK back when I was still "dumb" and impressed about such things. It was heavy, unwieldly, difficult to maneuver with,use with barricades, cover & took forever to reload. Sold it! Best thing I ever did. I use only 20 rd Mags either Hungarian, Yugo (hard to get) or magpul for the same reason I refer shorter ones in the Ruger PC. I have some 30 rd originals but rarely use one. If you think you need one you really need to ask yourself why and be honest. Expecting the world to collapse? When? Why? just MHO!