I've fired about 2,300 over 5 days, rolling in dirt, though a Colt M4 without cleaning. On day 4, I pulled the bolt carrier, wiped it down and reapplied oil.
I encountered 1 stovepipe that was due to me putting the ejection port too close to a barricade.
There were about a dozen others with me, shooting the same type/brand gun, with similar experiences (very few failures).
The M4 will run dirty, but it won't run dry.
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God gave you a soul.
Your parents, a body.
Your country, a rifle.
Keep all of them clean.
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