An 18 year old can legally posses a handgun in Nebraska. Doesn't that mean they can open carry it?
This
What Mntman and Dan has is correct since there is no law in Nebraska covering open carry (other than Omaha) anyone who may legally posses the firearm would be able to open carry it. Missouri actually made their law stricter than Nebraska, so I doubt it would have any effect on our honoring their permit to carry concealed. the Nebraska statute on recognition:
69-2448. License or permit issued by other state or District of Columbia; how treated.
A valid license or permit to carry a concealed handgun issued by any other state or the District of Columbia shall be recognized as valid in this state under the Concealed Handgun Permit Act if (1) the holder of the license or permit is not a resident of Nebraska and (2) the Attorney General has determined that the standards for issuance of such license or permit by such state or the District of Columbia are equal to or greater than the standards imposed by the act. The Attorney General shall maintain and publish a list of such states and the District of Columbia which he or she has determined have standards equal to or greater than the standards imposed by the act.
First the issue is not their concealed carry permit related, then their law is greater than ours. It also would not effect ours there because as someone else said, they recognize all permits.
There are a couple of states, Minnesota as an example, that look for tiny variances in the laws (even unrelated portions of the law) to block recognition of other state permits. As long as we can keep a friendly Attorney General we are alright.