This diopter is German HK production that was made for the HK G3 and HK33/53 series of weapons. This is a multiple weapon rear drum sight which is combat effective to 400 yards with NATO 5.56 or 7.62mm. These are not MMR223 sights for barrel specific rifles, rather a sight that works on all 5.56-7.62 weapons.Though the diopter sight and mounting hardware are German HK production, the Picatinny sight bases are not German. They are a high quality military grade reproduction made from aircraft grade aluminum with steel hardware.We also offer just the bases so you can add a more specific HK drum sight of your choosing: MP5, 33/93, G3, HK21/MSG90 1200M, etc; SKU HKK-1010 Condition of the parts: Front sight and rear sight base are brand new. HK Diopter sight is surplus VG-EX condition. They are as close to new as you can get from German army surplus. Might have a mark or two from demill but otherwise look fantastic.