Yeahhhhh... install "OEM"/Autoparts at your own risk, 922(r) applies, blah, blah, blah...
It's following the bolt (I think) so in the violent operation on firing, I'd say the hammer is getting away from the sear somehow that isn't being replicated by hand cycling.
You're seeing the light strike from the inertia of the FP + the strike of the hammer following the bolt. If you do it 100x with commercial .308, I'll bet the rifle will double at least once. (don't do that)
Ohhhhhhhh... it's a DSA???
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