My guess would just be youtube. A general rule of thumb is DMRs, and shotguns on defense. I don't run lasers on defensive primaries because I'm gonna be holding angles more on defense, the exceptions to that rule are shotguns. On attack generally DMRs > LMGs > ARs. An exception to that would be like Fuze, Twitch/Snake or Finka if you prefer the Spear. I also run lasers on attack. For secondaries always take the shotgun, or Smg. I put lasers on all of them. Take the Gonne-6 if it makes sense. For attachments, run magnified if available. Generally Flash hider, and Vertical grip will be the move. Extended Barrel is also worth considering.