Rob Allen Tuna Roller Speargun

Overview

The Rob Allen Tuna Roller Speargun is a band-powered roller speargun intended for spearfishing and bluewater use. Its roller layout increases the effective band pull by allowing the bands to work along more of the barrel length than a conventional band arrangement.

Power stroke and recoil

Pre-tensioned bands run beneath the barrel and travel around the roller muzzle as the system releases. This arrangement keeps the shaft under drive farther toward the end of the barrel, generating additional speed and momentum through increased band travel rather than by adding more bands.

Redirecting the band force around the rollers also counteracts part of the recoil created during release. Combined with the extended power stroke, this supports penetration and usable shooting range while reducing recoil compared with a conventional band layout.