in the last survey of 2002, only 14% of Guam residents owned a firearm. Getting a Firearms ID card allows the purchase and ownership of firearms on the island of Guam. The process is complicated, long, expensive and downright annoying. It will cost you a whopping $124 when it's all done!!! If you have the guts, the patience and the cash to take on this challenge, here is the process to get it done.