Benelli M4 stock retaining nut

[SDMay89]

Apologies if this is already a topic, but can anybody give me the specs and/or a generic name for the M4’s stock retaining nut so that I can hopefully try and find a replacement through local hardware/online retailer. Midwest has been out of stock for a while now, and Benelli themselves tell me they don’t carry the part. Thanks

[lockedandloaded]

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.