In terms of the context of this discussion- for "us" as outsiders, yes. But I do know of several native Americans living within tribal lands who own many guns. So for them as insiders, it may not be that different.
According to
this post at handgunlaw.us most tribes do not post their tribal laws on line so research is difficult. What little is posted suggests that many tribes are discriminatory issue at best. I suspect that in many cases here in the West at least, tribal members would face different (ie less severe) penalties for carrying on reservation land than would non-Indians. I also note that some tribes enjoy hunting or fishing rights on tribal or even non-tribal lands that are not available to non-Indians.
Remember though, that as semi-sovereign nations with vastly different cultures and heritages, many things we take for granted are different on the Res. At least the Navajo reservation has very limited private property rights compared to what you'd find in the USA proper. It is
often more difficult for a bank to write a mortgage against land on a reservation than elsewhere because of legal limits on mortgaging or otherwise placing the property at risk. The theory is that we don't want Indians defrauded from their lands (again). In practice, this also often has the effect of impeding economic development.
My sister teaches nursing at a community college in a community adjacent to the Navajo Reservation. As they teach their students each year they have to remind them, "While we are a first world nation, we are living next door to and provide service to many persons living in, a third world nation, with all the personal and public health challenges third world nations face."
The Navajo Reservation (and other large reservations in the West) is a whole different world. Many residents lack electricity, running water, or sewer or even septic service. It is not uncommon to have cases of Bubonic plague. STDs run rampant. Navajos often don't care for the service provided in the reservation hospitals and so go into non-reservation hospitals to give birth. A labor-deliver nurse from such a town told me, "Around here we consider a woman with zero prenatal care, preeclampsia, and fewer than 3 STDs to be a
routine delivery." They have to move into diabetes, the really nasty STDs, or some major physical trauma before the delivery is considered unusual or high risk.
Most of this is off topic here. But to begin to understand the vast difference between State and Indian laws on RKBA, one needs some insights into the vast cultural differences that pervade almost all of life between those on the Res and those not on the Res. And in some cases, this includes Indians who have very deliberately rejected the Reservation lifestyle and instead integrated into "white" society. The issue is not one of race/ethnicity, but one of culture.
Charles