is the mares sniper pro a good speargun for around Melbourne and Victoria for targeting squid and possibly kingfish or any other options. thanks.

You could do worse.
When buying your gear, try and get the best quality gun possible cause your only gonna upgrade in 6 months time.

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For squid i use a 1m gun. for kingies i have a 1.3m gun. I find the 1.3 is too big for squid in the bay. if you're new to spearing, i recommend getting the 1m and then later on going to a bigger gun for the kingies.