Trouble with speargun performance is that there are so many variables. My euro 90cm gun with a longer 140cm spear was deadly accurate with a single 16mm band but hopelessly inaccurate with a 20mm band. I assume that the non tracked gun and 6.5mm spear was not distorted by the power of the 16mm rubber but was distorted by the 20mm band. Maybe a shorter standard spear would have worked but who knows?
What I like so much about my Omer XXV Gold 90 is the fact that the short 6.3mm spear in the tracked carbon stock is not distorted by the super powerful 18mm band. This must be so as the gun is famously accurate. My efforts to produce such a set up has been woefully pathetic which just goes to show that manufacturers do go to long lengths to R & D their products to produce a successful design.
Still it is fun to try your own thing.
Dave
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