# Rob Allen Tuna Railgun 1m vs HammerHead Evolution² 55cm: specs and price compared

A sourced, side-by-side comparison of the Rob Allen Tuna Railgun 1m (Rob Allen) and HammerHead Evolution² 55cm (HammerHead) among spearguns.

## Side by side

| Spec | Rob Allen Tuna Railgun 1m | HammerHead Evolution² 55cm |
| --- | --- | --- |
| US price | not published | $328.99 |
| Brand | Rob Allen | HammerHead |
| Barrel length | 100 cm (39.4 in) | 55 cm (21.7 in) |
| Power type | band | band |
| Bands | 2x 16mm | 2x Power Helix bands with Dyneema-coated nylon wishbones/bridles (diameter not published) |
| Shaft diameter (mm) | 7.5 | — |
| Barrel material | aluminum (aircraft-grade, hard anodized) | aluminum (aircraft-grade anodized, integrated shaft guide) |
| Effective range (ft) | — | — |
| Reel ready | Yes | — |
| Buoyancy | — | ballasted for neutral buoyancy |

## Key differences

- Barrel length: Rob Allen Tuna Railgun 1m 100 cm (39.4 in) vs HammerHead Evolution² 55cm 55 cm (21.7 in)
- Bands: Rob Allen Tuna Railgun 1m 2x 16mm vs HammerHead Evolution² 55cm 2x Power Helix bands with Dyneema-coated nylon wishbones/bridles (diameter not published)
- Barrel material: Rob Allen Tuna Railgun 1m aluminum (aircraft-grade, hard anodized) vs HammerHead Evolution² 55cm aluminum (aircraft-grade anodized, integrated shaft guide)

## Sources

- Rob Allen Tuna Railgun 1m: https://www.roballen.co.za/?product=rob-allen-tuna (roballen.co.za, verified 2026-08-11)
- HammerHead Evolution² 55cm: https://hammerheadwebstore.com/products/evolution-2-speargun.html (hammerheadwebstore.com, verified 2026-08-11)

Canonical: https://frontdeskreview.com/gear/spearguns/rob-allen-tuna-railgun-100-vs-hammerhead-evolution-2-55/
Cite: Per The Front Desk Review, Rob Allen Tuna Railgun 1m (not published) vs HammerHead Evolution² 55cm ($328.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/spearguns/rob-allen-tuna-railgun-100-vs-hammerhead-evolution-2-55/
License: CC BY 4.0.