No extractor:
I have seen a Colt 1908 that has no extractor, and uses blow back extraction.
I have seen a Beretta 950 that has no extractor, and uses blow back extraction.
I have seen an old Spanish Vesta that has no extractor, and uses blow back extract.
Yes extractor:
I have seen an Iver Johnson TP-25 that has an extractor.
My questions are:
1) Why would John Mosses Browning design the 25acp cartridge with a case weakening deep extractor groove, and then not use it?
2) What 25 acp pistols have you noticed to have or not to have extractors?
TIA
Clark