Effective August 2, 2018, the Postal Service™ is revising the Administrative Support Manual (ASM) to clarify policy on the possession of firearms by Postal Service employees.

Administrative Support Manual (ASM)

2 Audits and Investigations
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27 Security
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276 Firearms Security
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276.2 Violations of Firearms Security
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[Revise the title and text of 276.22 to read as follows:]

276.22 Possession of Firearms by Postal Service Employees
Except for Postal Service employees who are authorized by the chief postal inspector or by the inspector general, Postal Service employees are prohibited from possessing firearms in the following instances:

a. While on official duty, either on or off Postal Service property.
b. While on or within Postal Service property at any time.

The term “possessing” includes carrying or storing of firearms.
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Source: USPS