Rhino Revolver: The new level 55-60 pistol, it would be an AE-50 or R-500 on a stupid amount of steroids. Would feature great accuracy and damage with a somewhat sluggish rate of fire and average reload and range.
KS-23: A very powerful, pump action shotgun that would be the new level 55-60 shotgun. It would feature a smallish mag size of only 4 rounds but would have easily the highest damage of most, if not all shotguns in the game. It'd have an average reload speed, range, and fire rate, with decent accuracy.
Banshee Sword: An upgraded version of the Tac Blade with increased knock back and aps while keeping only slightly increased aps. This weapon would be a bit better at dealing with higher damage/health infected but it wouldn't have that great damage per hit. Instead, its aps and increased knockback would be its main qualities.
Survival Hammer: A modern, black survival/tactical hammer with average damage but higher aps than normal for a blunt weapon. It'd still feature good knockback, but with slightly less damage than on average for higher end blunt weapons (higher than the Banshee Sword though).
I would have added more, but many of the level 51-55 weapons still compete (like the tmp and such) so ye
Quiver: Would increase the capacity of bows by 5 (default) and would add a small reload bonus and other small arrow related bonuses. When a bow has a quiver it acts pretty much like a normal firearm, only this time the aim time is the actual "reload" time between arrows within a quiver, and the actual reload time is the act of filling the quiver with new arrows or whatever.
Would have added more but I believe the new armors cover a pretty decent area.