More prominent safety, maybe an under rail or side rails standard. Doesn't need as much as those special edition ones. Maybe more options on lengths. I don't know go modular. Maybe add some porting? I think most of the new features should take into account whether we're using it as an under-barrel launcher or as a primary. Doc Zox seems to have the best suggestions. The only thing I think all new metadyne launchers should have would be a side ejection like the ST 9 side loading havoc launcher from Spike Tactical. But with a reversible option for lefties.