Metric M8 X 1.00mm, not commonly found stocked in Home Depot or Loews or Ace Hardware. I may be ordering a box of 10 from Amazon. If I do, I'll mail you a few.
Trying to remove the buttstock retaining bolt assembly from a factory Benelli M4 pgstock. Have only been able to remove the buttpad & stock retaining nut (#85). The rest of the assembly (#86,87,88,89) all seem to be stuck together. Any help appreciated, thx