If you have bought Osprey Fountain Pens ( Milano, Scholar or Madison models) with extra nib units, and wish to convert the nib unit into an assembly for easy swapping between pen barrels, this assembly does exactly that. 

An Assembly gives you an Outer Grip Section with an Osprey Converter. You can simply thread in a nib unit and plug it into the barrel of your pen.

Note: The generic outer grip section is Clear for Madison model and Black in color for the Milano & Scholar.