You are right
Printable View
There is Geissele URG in there somewhere.
https://i.imgur.com/EonzejUm.jpg
I see the Geissele website lists the rails as all 7000 series aluminum. Has this always been the case?
wow, this is news to me. thought it was always 6061
MK14 shows 6061 series
MK16 shows 7000 series
MK4 Federal shows 7000 series
Mk4 shows 7000 series
MK8 shows 7000 series
MK18 shows 7000 series
all their HKs show 6061 series
Mk1 is 6061