You can also modify your muzzle to a "scorpion like" one. A dremmel and a file can do wonders. It is advisable to put a shaft guide (Omer and JBL have it) over the barrell when you use circular bands. As far as I recall, the Basik is not a railgun, so it has a cilindrical barrell.
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Marco

Hey this post was a while ago but was wondering if you actually did grind down a closed muzzle to make it an open and how did it turn out? I have a picasso century and was going to buy a hammerhead for it but if I can do it that way it would save me 50$. Thanks!