For expedient water purification i'm using the Katadyn MP-1 tablets, which supposedly deals with Cryptosporidium as well, but with only 24 tablets I'm also looking into longer term solutions, hence the makeshift filter and boiling. Back to the original question, thanks for the feed back on the airgun. I do believe I'll be including an airgun in my survival kit. Eventually i'll evaulate this for myself in the field but it certainlys sounds to be worth a try. All your feedback is greatly appreciated as well as any other comments.

Thanks,