iv allways been told, they where just a sales ploy, and more likely to split balls cos they rifled, its fine if its a metal slug... *hides from any form of tellingz off*
mm, i dunno, have no clue with timmys, but length depends on your position, and i think the rest is mostly down to your ability, except barrel kits, they rule
freaks are nice - but then there are a billion threads on whether freak or lucky are best - see if you can try them for yourself first as everyone has biased opinions