hammers ship with a 690 barrel and have Nelson style internals.
MR5s ship with a 687 barrel and our latest stack tube with EKO valve.
so two completely different types of systems and shouldn't be compared. being that the MR5 has a smaller bore on the barrel, you could get some pretty accurate shots.
personally i think just about any gun can be as accurate as the next gun as long as it is setup properly.