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MIL-P-18761C(OS)
(Application for copies should be addressed to the Superintendent of Documents, U.S. Government Printing
Office, Washington DC 20402.)
2.2 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample of the cartridge case shall be subjected to first article
inspection (see 6.4) in accordance with 4.4.
3.2 Characteristics. The primer shall conform to the requirements specified herein and on Drawing
3028613.
3.3 Radiographic (M101). The primer shall not exhibit any loose components (except black powder) or
missing or extra parts. Primers exhibiting possible defects shall be included in the detail strip sample and meet
the requirements of 3.5 (see 4.7.1).
3.4 Black powder moisture content (M102). The moisture content of the black powder within the primer
shall not exceed 0.70 percent by weight (see 4.7.2).
3.5 Detail strip. The primer and its components shall conform to the following requirements (see 4.7.3):
a.
(C1) Each critical characteristic shall be as specified in the applicable documents listed on
Drawing 3028613 and this specification.
b.
(M103) Each major characteristic shall be as specified in the applicable documents listed on
Drawing 3028613 and this specificaton.
3.6 No-fire (C2). The primer shall not fire in the no-fire test (see 4.7.4).
3.7 Functional. The primer shall meet the following criteria (see 4.7.5):
a.
(M104) Primer functioning time shall be a minimum of 0.006 second.
b.
(M105) The primer shall not misfire (see 6.7.1).
c.
(M106) The primer shall not exhibit blowback (see 6.7.2).
d.
(C3) The primer shall not exhibit a split stock, split tube, or detachment of metallic parts.
3.8 Vibration. The primer shall meet the following requirements (see 4.7.6):
a.
(C4) The primer shall not function during vibration.
b.
(C5) The stock and tube shall maintain material integrity, and the primer shall maintain assembly
integrity at the mating threads of the stock and tube during vibration.
3

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