I just cleaned my Stoeger 2000 and a small part on the receiver part # G01. I didn't know what it was very small maybe close to 1 inch long and maybe a 1/8th inch thick, flat on one side two holes one small hole the large hole was near a metal solid pipe. The first hole side has a spring inside that pipe. I looked on the drawing I got from you it's in back of the G01 and right side of the A02, bolt handle. It looks like a lock piece holding that part fell off. Could anyone tell me what it is so I can order that part.
This link will show the parts