I chose a ToolCraft (now owned by PSA)..
Highlighted and circled for your viewing pleasure
Rgr - thx. I always assumed that the flats were created for ease of machining and not for functional improvement.
This is usually what sand cuts look like (modeled after the FAL):Heard them called “sand cuts” before.
Looking into the matter as much as my Google-fu will allow, D. Ray Porter owns ToolCraft Inc of Marion, NC and that is not the owner of PSA. ToolCraft does supply bolts to PSA and under defense contracts supplies materials unspecified to FN (likely carriers, if not full BCGs). If someone has proof that PSA has absorbed them I’d love to see a link.