The Rob Allen Cobia is the new improved version of the Scorpia Rail. It boasts all the same hardware as a top end railgun but is sold at an entry-level price point. To make them more affordable the Cobia range is made with a slightly thinner barrel (1.2mm compared to 1.45mm on the other Rob Allen guns). This is more than thick enough for these shorter-length guns. However, we would not recommend converting one of these into a roller gun due to the extra forces this puts on the barrel.

The gun is rigged with a 6.6mm double notched shaft 1 x 16mm green rubber Railgun barrel Vecta 2 handle and mech making it the safest speargun on the market. They range from size 50cm, 60cm, 70cm, 80cm, 90cm, 100cm, 110cm.