Originally Posted by
Ex Pres
You know, I've not checked my seltzer cartridges, but the unthreaded 12g ones I use for my tires are made for paint/BB guns.
Yeah - I happen to buy the Crossman 24 packs, but my Co2 inflator takes everything threaded or unthreaded, 16g or 12g. I bought it a Performance, and it really works great.
I don't do seltzer.

BTW - I've heard (but not confirmed) that the 16g are commonly used for beer taps or home brewing... I forget which. anyway, on those types of supply sites, the 16g are supposed to be way cheaper than the LBS $3/ea prices.
Personally, I carry 4 12g with me, and it has been more than sufficient for all the miles/years that I've been at this.