to me the west german models are nice collectors. the breech block insert is supposed to be replaced every 5k rounds IIRC, something around there. the old folded steel slides with breech insert were a band aid design. while I also rag on NH built Sigs, the US built steel slides are made to go forever. my preference is the short external extractor as seen on the P220s, older P226/229's and MK25. the german guns are internal extractors.