I also suggest New Designz spring detents kits, those stock rubber nubs don't last too well.
Clamping feedneck, barrel, trigger and detents is what I did and the gun has shot fine and perfect ever since.
08 Proto SLG: Ultralight Trigger, Freak Barrel, Featherlight Microswitch, Spring Detents, New Designz Feedneck. Plans for 7th Element board.
05 Smart Parts Impulse: NDZ Trigger, Blackheart board, Tapeworm, Evil Punch Kit. Plans for a low profile feedneck, Evil internals and respirator.