http://www.defensereview.com/the-big...m4-unreliable/
Guys with DI systems will need to avoid those 2400 round firefights. As they will need a truck to haul the 2400 rounds getting out of Dodge will be much easier.
The trick is get the buffer and spring right.
That's where the R.E. in S.E.R.E. comes in handy.
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