cavalierdefenseI’m not an expert on these but know it’s an HK Trigger Housing for MP5 style gun. This particular cut also fits the 40 cal guns but believe it it works fine for 9mm too, only difference is a little relief cut in upper right top of the housing. Again not an expert but think you need Ambi pack for this? versus an SEF pack(someone please educate me if I’m off base) Does not have markings inside other than “IS” date code Happy to send more pics if helpful $115 OBO
