My Express doesn't suffer droop.
The ball catch works just as it does on many Dianas
The breach adjusts so as to set the jaws for drag.
The only minor issue is the Chinese failure to use a shim under breach seal.
That can cause a consistency issue
I use the shim from a Diana model 34 and a BS109 O ring and it's sorted
Replacement breach seals are then pennies in a choice of 3 hardness types.