Hop-up is the main one. Barrel quality second, I think.
I don't see many aeg's that are more accurate than my MP5K PDW. It has a 141mm stock TM barrel, and stock TM hop-up. Shoots like a laser.
And, it is a great gun for someone that is 5' 6" tall. Nice and compact, best for cqb but because it's TM good to go anytime.
Last edited by venture; November 21st, 2009 at 22:34..