Hello all, I'm new to THR and sorta new to the whole Ar building thing as well, only tinkering and such with mine up until now. Here recently I have been seriously looking around at what parts to get for my first build, and one of the biggest things that I've been thinking about with it is were to put the gas block/tube at. I'm almost possitive I'm gunna get the White Oaks SPR 18'' barrel (which has a 1:7" twist which I'm not to sure about either so if you have input about this twist ratio help me out as far as accuracy goes for the twist) but haven't been able to decide on whether to get the barrel with a Mid or Rifle length gas system. If someone could chime in on what the pro's/con's of each are as far as reliability and accuracy it'd be VERY appreciated. Thanks for any imput.