Well first of all i think we both agree that eather solitus or opifex are a great breed for a fixer. Solitus has its advantages and opifex his. In essence its a personal choice. But when i say that opifex is a fixer breed is not really my opinion. What I was trying to say there is that when FC thinks of Fixers thinks of Opifex breed and some future items might be influenced by that. That might be a good/bad thing I just tought to mention it. The reason i got to this conclusion is when i look at some of opifex only times that are coming in 14.5. Who knows maybe the solitus items might be better for a fixer then the opifex ones.
About why i went MCS instead of Sol or Kearan Grinner is because I think MCS/MPS are more easier to find or get then Sol. In the end again is a personal choise. I think MCS is the best damage for a gun thats easy to get. At low lvls if you a big powerleveler like me you got no time to hunt special weapons. Some ppl take it slower and like to experiment and use different weapons then other. But this guide is made more for ppl who wont to go from 1-150 quick and then with all of the xp expand the caracter. Truth is till 150 you don't have the IP to play to much.
After all i have all of them in ql 200 a MCS, Sol, Kearan, and even a Excelent River 6 and in PvP i'll probably use the one that does best damage.
Now in PvM as soon as you can equip a CHS other weapons become secondary only for PvP because CHS is so much better with its 10k FA. Of course 15% scope is an item that is almost neccessary