Just my two cents but both Apeks and Atomic are making the best breathing regulators on the market today. I own both types but I must say that I have been favoring the Atomic (M1) set more as of late.
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superstar:So let me get this straight, you dive a quarry, then blast ammo during your surface interval. I love it. It would be a great place for my daughter to learn to dive, she would fit right in with the shooters.