Between my own guns and friends/family guns I've used:
Riffe metal tech/euro/padauk, Mako predator/oceanic pro, Rob Allen, Omer Cayman, lots of scuba guns (billers sea hornets etc).
The barrel really seems to make the gun move in the water amazingly. Its by far the best handling speargun I've shot, even though its longer then most other guns I've used. Most of the guns I listed above feel like pushing and swinging around a log compared to this gun. The cf barrel also makes the gun really quiet and smooth compared to al rail guns.
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