Extractor Kits that fit Mossberg MVP 5.56/.223, these extractactors are manufactured and heat treated from 416 ss, with a hardened 440C ss ball, and a zinc-plated compression spring.  Kit will include (1 each) extractor, (1 each) ball, (1 each) zinc plated compression spring.  These are not the mim'd parts that come from the factory with these rifles listed, far superior extractor.