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Im just a gun plumber who shoots alot, so take this for what its worth:
I think your weight limitations are too low, also you just said M4's, you didnt say M4CQBR's or suppressors, or if your using real US or Nato M855 or if its all Mk262. Each of those items change what you can expect to see as far as maintenance issues. How much Team training is going to be conducted on the deployment?
Without that clarification think about the following:
Brand new upper, bolt and bolt carrier plus all lower internals and springs replaced prior to deploying:
Each guy should have a spare bolt assembly, a spare extractor with 5 coil spring and O ring installed,, Bolt Cam, Firing Pin retaining pin, and a spare set of gas rings. I would also consider a spare action spring.
The 18B's need a Brownells pocket 556 throat errosion gauge, No-Go headspace guage and a Castle nut wrench. Everyone should have the needed allen wrenches to tighten up their own gear as part of PMCS and a hammer and a broken punch work for staking and should be part of someone elses kit.
If you want to go into service life of bolts, gas port and throat errosion based on round count in different AR platforms and such let me know.
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"Wide Awake, Wide Awake"
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