The drop forward mounts directly to the bottom of the Fokus handle frame and fits all nitrogen and compressed air tanks. The bottle adaptor slides forward as much as 5" with a 4" drop. The cradle portion has a dovetail at the end to accept tanks with dovetail mounting. It comes with the proper length of hose and will fit Fokusí with a front foregrip or expansion chamber. It is available in five colours; Black, Red, Green, Pewter and Champagne.
The Mokal Fokus Drop Forward is older, so while it may be available used and in a few cases new, it is not commonly available anymore.