I am pretty sure that those are from the Chinese (meant to be used for the Type 53 Rifles). I have about 30rds of original Chinese 7.62x54r on those brass clips (don't really intend to shoot it as it is the only 7.62x54r I have ever got on its original clips). Apparently from what I have heard the clips work pretty well but aren't the best for longterm usage just due to being made out of brass.