Newly manufactured CHROME LINED barrel with original German barrel collar installed and properly headspaced.
Barrel Material: CrMoV - GBQ
Commonly called "CMV"
This durable material was imported from a specialty steel manufacturer in Germany and is well suited for machine guns. It is also certified to meet MIL-B-11595E specification for US military gun barrels.
Bolt: 8mm bolts work with the 7.62 NATO/308 conversion top covers and barrels. Remember: Original 8mm bolts work with both 8mm and 7.62 NATO/308 ammo while the MG3 bolts and extractor sets only work with 7.62 NATO/308 ammo.
Booster: Typically the regular 8mm booster set provides enough energy to cycle 7.62. If you have the enlarged Yugo booster with short barrel sleeve you may need to switch out to the standard German setup. Just replacing the barrel sleeve or booster from an 8mm or 7.62 German setup should give you enough energy to cycle the gun. The longer German barrel sleeve and smaller diameter booster cone hole are designed to trap more pressure in the booster assembly and push harder on the front of the barrel to actuate the short recoil system.
Feed: There are several top cover and feed tray setups that can be used to convert from 8mm to 7.62 NATO. (see below)