# Rob Allen Tuna Railgun 1m vs Mares Viper Pro DS 75cm: specs and price compared

A sourced, side-by-side comparison of the Rob Allen Tuna Railgun 1m (Rob Allen) and Mares Viper Pro DS 75cm (Mares) among spearguns.

## Side by side

| Spec | Rob Allen Tuna Railgun 1m | Mares Viper Pro DS 75cm |
| --- | --- | --- |
| US price | not published | $299.95 |
| Brand | Rob Allen | Mares |
| Barrel length | 100 cm (39.4 in) | 75 cm (29.5 in) |
| Power type | band | band |
| Bands | 2x 16mm | 2x 16mm S-Power speed circular slings with Dyneema wishbone |
| Shaft diameter (mm) | 7.5 | 6.5 |
| Barrel material | aluminum (aircraft-grade, hard anodized) | aluminum (rigid anodized, with shaft/line guide) |
| Effective range (ft) | — | — |
| Reel ready | Yes | — |
| Buoyancy | — | — |

## Key differences

- Barrel length: Rob Allen Tuna Railgun 1m 100 cm (39.4 in) vs Mares Viper Pro DS 75cm 75 cm (29.5 in)
- Bands: Rob Allen Tuna Railgun 1m 2x 16mm vs Mares Viper Pro DS 75cm 2x 16mm S-Power speed circular slings with Dyneema wishbone
- Shaft diameter (mm): Rob Allen Tuna Railgun 1m 7.5 vs Mares Viper Pro DS 75cm 6.5
- Barrel material: Rob Allen Tuna Railgun 1m aluminum (aircraft-grade, hard anodized) vs Mares Viper Pro DS 75cm aluminum (rigid anodized, with shaft/line guide)

## Sources

- Rob Allen Tuna Railgun 1m: https://www.roballen.co.za/?product=rob-allen-tuna (roballen.co.za, verified 2026-08-11)
- Mares Viper Pro DS 75cm: https://www.americandivingsupply.com/Mares-Viper-Pro-DS-Speargun-p/423426.htm (americandivingsupply.com, verified 2026-08-11)

Canonical: https://frontdeskreview.com/gear/spearguns/rob-allen-tuna-railgun-100-vs-mares-viper-pro-ds-75/
Cite: Per The Front Desk Review, Rob Allen Tuna Railgun 1m (not published) vs Mares Viper Pro DS 75cm ($299.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/spearguns/rob-allen-tuna-railgun-100-vs-mares-viper-pro-ds-75/
License: CC BY 4.0.