Different CO2 cartridges?

[Kak543]

I usually buy Umarex branded CO2 cartridges at my local store, 25 cartridges for 15 €.
I've seen online there are cheaper ones if you buy like 50 or 100 ones, but they're different, seem less shiny, and there's only "Umarex" written, not all the small safety phrases and such... Sometimes they're labeled "Umarex by Airstream" , and there are other labeled only "Airstream" even cheaper.
Are them all the same so I can just buy the cheaper ones, or there are "hidden differences?"

 

[Treefrog]

If they're labeled as containing twelve grams of co2, then they should be the same. Count the number of shots that the different brands give you at the same temperature. That should tell you if any are less than what's advertised.

Edit - You could weigh them before and after use, as well. If there isn't a 12-gram difference, then something ain't right.

Cheers,

J~

 

[c_m_shooter]

Should be the same. That being said, some have had difficulties with tolerances of certain brands of carts not agreeing with certain guns.