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本帖最后由 foxea 于 2016-4-16 20:43 编辑
另一个观点：Why BCM chose the 11.5" SBR over the 10.5"
The 11.5" carbine is approximately 4% longer weapon than its' 10.5" counterpart, but this extra inch gives the barrel a 40% increase in length for dwell time. IMHO, this is an excellent trade off. This additional dwell time (all other things being equal) will allow the carbine to be more forgiving to different ammo types, extremes in air temperature, weak or worn extractor springs, worn extractors, buffer weights, etc.
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发表于 2016-4-16 19:40
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