I ran across this article on converting Makarov gas guns while doing a page.
http://www.dailymail.co.uk/home/mosl...g-machine.html
(BTW, I love the caption on the first photo: "The Baikal IZH-79: The handgun can be bought for as little as £1,200 from gangs in the UK's largest cities." At today's conversion rates, that's
only $1850.)