VZ 58 to AR 15 Magwell Adapter to use “OG” aluminum or steel mil-spec USGI AR15 / M16 magazines. Polymer magazines will NOT work in this adapter ! We successfully tested function of following manufacturers: -EMTAN Mfg -NHMTG -D&H Industries -Okay Industries -Lancer model L5AWM surplus USGI 30rd mags from: Colt, Adventure Line, and Labelle. Made by Czech Small Arms in the Czech Republic.