Lvl 18 top machine gun does 50-60 dmg while level 20 Rare top machine gun only does 50.They even use the same amount of bullets. Level 16 Blaster is generally better than the top machine guns as it doesn't use bullets.
XR14,XR16 and XR18 are basically useless as the lvl 16 Blaster has more damage with same range on a lower lvl.
Sun & Moon (lvls 27 and 28) are almost the same weapon with just 2 damage difference. Is this really necessary ?
Level 18 Large yellow laser is a totally overpowered weapon, and it's classified as epic. Atleast make this a Legendary weapon.
Dactyl & Mamut are useless on their level brackets, as both levels have better torsos compared to them. They are even both considered legendary.
And finally not really a balance question, but there are 7 pairs of different legs all labelled as 'legs' A little bit more imagination in the names would be nice