Rob Allen Snapper Railgun

Overview

The Rob Allen Snapper Railgun is a band-powered railgun for general-purpose spearfishing. Its aluminum barrel incorporates a continuous rail that supports the spear from the mechanism toward the muzzle, providing a consistent path along the length of the gun.

Rail design and handling

The rail is formed as part of the barrel rather than fitted as a separate track. In addition to supporting the spear, this construction increases longitudinal stiffness and reduces barrel flex. The rail profile aligns with the mechanism and muzzle, while the low-profile muzzle reduces frontal area compared with conventional muzzle designs to limit drag when maneuvering the gun underwater.

Loading setup

When loading the railgun, the shooting line should remain on top of the spear rather than passing underneath it. Line trapped beneath the spear can lift it away from the rail and interfere with its supported path. As the bands are loaded, the line moves to the side and does not need to run beneath the spear.