This new extractor spring was remanufactured for MarColMar Firearms according to our specifications. The extractor spring material has been upgraded to Chrome Silicon to increase durability and heat resistance. The extractor spring is the first item to wear on a roller-locked firearm, and is essential for your spares box, in order to keep your MarColMar CETME L functioning properly. If you are having failures to extract or even eject, this is the first part to replace.