Call Mossberg Customer Service. They will ship you free if still under warranty. I have an ATR and I heard earlier ATRs extractor may break easily but not sure about recent ones. How old is your rifle and round count? The ATR extractor construction is very similar to Savage's. Actually I put my 308 ATR extractor onto a 308 Savage bolt head that I have and it fits in the extractor slot just fine. Don't know about function.