My personal opinion
Iliken the39 CFR cite as being equal to the famous VCU admin statute prohibiting firearms.The VCU statute pertains to violations commited by "members of the University Community" (Students, teachers, employees). The CFR is an employee handbook, if you will.18 USC, Section 930 is the United States Code, the highest law in the land. Even the CFR says that its rules do not overide Federal Law (US Code). If the US Code says that its ok, then its ok in my book. If you are an employee of the Post Office, then you are subject to the CFR just like an employee of Ukrops is subject to the Ukrops employee handbook, except that the CFR has criminal penalities associated with violations by employees.
Again, I'm not a lawyer
I dont play one on tv
I didnt stay at a Holiday Inn Express last night
I'm just a guy with a gun.