4.7 Methods of inspection.
4.7.1 Primer sensitivity. The test shall be conducted in
accordance with SCATP-5.56mm, Chapter 4, Section 1, utilizing the
ball and firing pin identified on drawings 10520006 and 10524139.
The complete rundown test shall be performed until such a time
that the Government authorizes use of the 2 height test (with
complete rundown tests performed at some specified interval).
4.7.2 Residual stress.
Test in accordance
184.108.40.206 Cartridges with brass cases.
with SCATP-5.56mm, Chapter 1, Section 8.
220.127.116.11 Cartridges with polyethylene cases.
accordance with Appendix A.
Testing not required.
Cartridges with steel cases.
18.104.22.168 Cartridges with cases of other materials. Test in
accordance with procedures approved by the Government appropriate
to the material(s) used to manufacture the cartridge.
4.7.3 Waterproof. The test shall be conducted in accordance
with SCATP 5.56mm, Chapter 1, Section 14.
The test shall be conducted
4.7.4 Chemical compatibility.
in accordance with Appendix B.
4.7.5 Function and casualty. Function and casualty and the
following tests shall be conducted in accordance with Appendix C:
cyclic rate, screen perforation with BFA, breech flash, fouling,
and cartridge ejection. All firings in the M16A1 and M16A2 rifles
shall be performed utilizing a "soft" mount which simulates
shoulder firing conditions. Hard mounts shall be utilized for all
M249 and M231 firings. All mount designs shall be submitted to
the Government for approval. Except as otherwise specified, all
firings in the M249 machine gun shall be conducted with the gas
regulator set in the normal (rein gas) position, if the weapon has
NOTE: Temperature conditioning shall be as follows: 70°F ±
2° for not less than two hours; -25°F ± 2°F and 125°F ± 2°F for
four to twelve hours.