Just finished building my own speargun , I used an aimrite bcarbon barrel 140 , ermes handle and reel , HRC 175*7 shaft and double pathos nitro 16 mm bands .
Got very accurate and powerful 6 meters shots after many modifications for the bands and the flopper .
The only problem is that it is very hard to load and the shafts whips if loaded on the last shark fin , trying to find a better sweat spot , any tips please