Rob Allen Tuna Aluminum Railgun

Overview

The Rob Allen Tuna Aluminum Railgun is a rear-handle, band-powered speargun for spearfishing and bluewater use. Its aluminum barrel incorporates a full-length rail that supports the spear and forms part of the barrel structure.

Rail design and function

The rail is integrated into the barrel rather than fitted as a separate component. It supports the spear along the barrel toward the muzzle and aligns with the profiles of the trigger mechanism and muzzle, maintaining a continuous guided path. Because the rail forms part of the barrel structure, it also increases stiffness and reduces flex under band load.