i would say they both are great mods just the ggts can use a few batterys more than p18 in my opp i like the ggts better... locking button ... adjustable sizes for your preference ...that is just my opp...
I have had a P18, but kept the GGTS because of the locking button and adjustable airflow ring. I can't deal with a button that can fire off in my pants / jacket.
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