The threaded holes are for attaching the Pic rails.ok, so I’m not crazy? Lol
I have 2 key mod ARs and 1 MLOK and this AR doesn’t look like either. I’ll call Midwest industries Monday.
All those small holes in between cuts are threaded, btw. Not sure if that’s significant. You can see a swivel stud I installed for a bipod but I’m trying to install a rail for a Atlas bipod.
My PTR is the same way. Notice rail at 6 o'clock. Attached from the factory.