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Let me throw this out there. You built this yourself so its' an AR Frankengun. Here are few things.
1. Will it work with regular magazines?
2. What components did you use to build this?
3. Did you check things like firing pin protrusion, headspace, etc...
4. Are you absolutely sure that the hammer spring is installed properly?
Is it possible that this ammo was subjected to less than ideal conditions?
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