the gun you have is a romanian training rifle made in 1969 it is a 22lr and the magazine you are missing is a 5round clip the gun you have is worth 50-100dollars depending on the condition and for the magazine i would check army surplus stores or local gun shops you might also try gun auction sites on the internet like gunbroker.com or auctionarms.com i have seen several guns like yours on these sites and there have been severl sold very cheap for parts so you might find what you are looking for. I hope i have been of some help and good luck