RS Regulate GKR-6MY, 6 Handguard, M-LOK, Fits Yugo/Krink Style PDW Models, Anodized Finish, Black, Not Compatible with Russian or Bulgarian Type PDW's GKR-6MY The GKR-6MY is a 6" drop-in fit MLOK rail for Yugoslavian/Serbian/Zastava M92 and M85 Krink-Style PDW's (will not fit Russian or Bulgarian type PDW's). Matches best with traditional wood or polymer style upper handguards. It mounts similarly to the factory handguards" you will need a factory style front handguard retainer. You can add your KVAR rifle style stainless heat shields for added protection" and you can use a cleaning rod. Weighs 3.8 ounces with all hardware included.