I'm from the PH and would like to know that too. The ones I've found online have been sodium nitrate.
That's interesting. May I ask what gas you're going to use and where you got it/ are getting it from? I found a website selling 100% pure nitrogen for P5k but it'll be coming from abroad and I'm not sure if there will be any problems with importing.
I heard getting a gun is easy as fuck in this country but I haven't tried researching how yet.
Nitrogen as well but I havent purchased it yet. I've gotten leads on tanks, etc, and also looked at the options to either get a tank then have it filled or brand new tank already with the gas.
Unfortunately i'm a bit OC with the location so I would need to secure that first, so right now the research is headed more into the locations (inland or out at sea, which requires looking into areas with little to no shipping traffic, etc).
If all goes according to plan (fingers crossed) then i'll obtain the equipment necessary for device itself once the location is sorted. i'd like to use something like a sarcopod, but the plans arent available yet so that's another rabbit hole.
as for the firearm, i'm not quite sure of someone else's experiences but one thing i noticed is that in order to obtain an unregistered one, you'd need to have an introduction to someone who is willing to sell their old unregistered one. I recall purchasing an old .22 from an officemate. we werent that close, but close enough. however, even then he asked me questions like "what you are gonna use it for, have you had training, etc".
if you buy one legally then there are still tests you need to go through (psych evals, etc) but some shops are wiling to process that on your behalf, as far as I heard. didnt consider firearm method as I dont trust my aim that well.