Well the problem is in order for something to contain HPA in Canada, it has to have a TC Stamp and be hydro statically tested in order for the "container" not to blow up. It would be extremely expensive in order to design this new magazine, plus the testing for each mag, and depending what they are made of, they need to be re tested every 5 years(this means china made anything would be a no go unless you like death + illegal). BTW, I probably wouldn't want to drop them either... The practicality of said item and cost wouldn't even be worth considering. The smallest HPA I've ever seen is 13 cubic inches, and those are well over $100 and custom made.
You would probably be better off taping hand warmers to GBB, yeah it look dumb, but hey no cool down, or at least less.
Last edited by T_A_N_K; January 5th, 2009 at 21:43..