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MIL-STD-139 Revision A, January 5, 1965
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RADIOGRAPHIC INSPECTION, SOUNDNESS REQUIREMENTS FOR ALUMINUM AND MAGNESIUM CASTINGS (FOR SMALL ARMS PARTS)
Includes all amendments and changes through Interim Notice 2, May 15, 2014
Additional Comments: INACTIVE FOR NEW DESIGN
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This standard covers the radiographic inspection of aluminum and magnesium sand, investment, permanent mold, and die castings. It establishes radiographic standards and standard inspection procedures for use in acceptance inspection of small arms parts for which radiographic inspection for soundness is specified.

The quality of castings shall be of the following classes:
    Class 1 - Very high stress.

    Class 2 - Medium to high stress.

    Class 3 - Low to medium stress.