As an object of art...those are tres-cool.
But...I'm in agreement with those who are questioning the structural integrity of the material. It's likely not as strong and tough as properly made modern steel so I'd consider these 'looking at' guns and not to be fired.
Oh...one thing in the article claims that these are the FIRST mechanical devices EVER made by Man using a meteorite..but I think this is incorrect. Some of the Medieval swords were made from meteorites and were then thought to possess some Magical Properties...which they might very well have! But the swords were forged and properly worked to create the blades and not just hacked out like these pistols. (they ARE just hacked out..right?)