How To Rig Bluewater Roller Speargun to Breakaway
Roller Speargun Basics
The biggest difference between rollers and conventional spearguns is the bands. Roller spearguns have the bands start underneath the speargun and move up to the muzzle. The bands have to have tension while at the muzzle to work properly. This is called pre-tension. It allows the spear to accelerate the entire length of the speargun. It also allows for more total band stretch. We tension the bands on our own Neptonics double roller to be pre-tensioned at 10%-20%. All of these things put together result in increased range and penetration in the water.
Shooting Line
Spectra is the best shooting line for roller spearguns because of the shape of most roller heads. Shooting line flexibility is important to prevent entanglement on the roller muzzle. We always tie our spectra on with a double figure eight knot because it is the strongest knot for keeping line strength. The weakest part of any line is going to be the knot or splice, so you need to try and use the strongest knots you can.
Because the distance these bands are pulled is longer, the range of these spearguns increase. That means we need longer shooting line than a comparable speargun. Three wraps of shooting line to a double roller speargun does the trick. Two and a half wraps works fine if you have it rigged to a bluewater reel.