- 960 rounds at -60F for Reliability at Low Temp
-For carbine-length weapons, 27 out of 65 malfunctions occurred during low temperature testing. For
mid-length weapons, 16 out of 30 malfunctions occurred during low temperature testing. For low
temperature testing, carbine-length weapons had 333.3 mean rounds between failures (MRBF) compared
to 836.1 MRBF for ambient temperature testing and mid-length weapons had 562.5 MRBF compared to
1993.8 MRBF for ambient temperature testing. Approximately half of the total malfunctions recorded for
both carbine-length and mid-length weapons occurred during low temperature testing, so the relative rate
of malfunctions between carbine-length and mid-length remained similar to that of ambient temperature
testing.
- Averaged overall bolt speeds and differences in bolt speeds are presented in Table. The P-Values of
bolt speed results for both suppressed and unsuppressed fire are less than 0.05, so there is a statistically
significant difference between the two gas systems. Bolt speed is uniformly lower for mid-length gas
systems when compared to carbine-length gas systems. Mid length bolt speed was 2.13 fps, or 12.4%,
lower than carbine-length for suppressed fire and 3.23 fps, or 22.6%, lower for unsuppressed fire.
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