consistancy of FPS between shots (consistant airseal), hopup, bore of the barrel and length of the barrel to a certain point. Barrel doesnt effect as much as you think it would, but shortened to a point obviously accuracy will be effected, as well as large bore would make a bb bounce around.
TM MP5k PDW -ris, stubby grip, DNTC, electro
KWA USP 45
"SNIPER" is NOT a gun. It is a person. Saying "I use a sniper" is like saying "I fly a pilot".