never shot one on a 39 but they shot well on 1911 style guns. can be ammo particular. btw, good luck finding one. best chance would be a wanted ad here and on the various internet gun sales sites. to my knowledge, they haven't been imported for several years. think they are still in business in germany. might try a search in that direction. if you find one whose owner what he has, it will probably cost a few bucks.