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Old 08-07-2008, 01:23 PM   #2 (permalink)
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Location: Hyattsville, MD
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The 4 oz. tanks are older and most of them were sold through Brass Eagle.

Generally, the 4 oz. tanks are steel (versus Al-Mo alloy for the 3.5) and they are significantly heavier.

The shape is different and the 4 oz. tanks are slightly larger in diameter. I'm not sure if they exceed the 2" rule and since I sold my old 4 oz. I can't just caliper it but I know they're very close.

The 3.5s are under 2" in diameter and thus never need re-hydro.

Don't worry about getting a 4 oz. tank, if that's what you're wondering. They're heavier, older and are prone to corrosion. The 3.5 is a better choice if you're looking to buy, plus it's easily available.
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