I’m guessing it just means it has a triangle side folding stock.
That’s literally exactly what I wanted to know. Thanks.Short answer is a 7.62 AKM with a AK-74 style triangle folder.
Long answer which you already have a handle on- Khyber Pass is a region that straddles Pakistan and Afghanistan. They are somewhat known for their gunsmiths that make rifles and conversions sometimes from scratch with crude tools in mud huts. During the Afghan war and after photos surfaced of Afghans with AKM's that had been converted to triangle folders, something the Russians never made*. The folders could have presumably come from captured AK-74s or in house made copies. The Afghans wouldn't have just used the 74's because they would not have had steady access to the ammo at the time. Americans have since noticed and took a liking to the sidefolder over the underfolder found on AKM's, and hence when we build a copy of a rifle with no official designation, it was referred to by the inspiration, it becomes known as a Khyber.