Popped primers are more common than most people think. Popped primers landing in the most weird places (Cam pin holes, inside gas keys, in gas tubes) and locking up the weapon. If you're lucky, it will just pop loose and not get lodged into anything. As others have stated, it's usually with out of specked chambers (BM, Oly, Stag, DPMS) and XM193.
For God and the soldier we adore, In time of danger, not before! The danger passed, and all things righted, God is forgotten and the soldier slighted." - Rudyard Kipling
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