I witnessed a semi-auto Bushmaster go 3 round burst the other day. It fired a 3 round burst on the shooter, then as they had a moment of "wtf!?" and began to remove the gun from their shoulder and set it down...it fired off another round.
The shooter was a Marine who exercised good trigger finger discipline when I observed him (I was the RO). He swears he didn't pull the trigger and the gun fired on his own, and I'm inclined to believe him. I witnessed the gun fire the 3 round burst, and it wasn't just him shooting fast. I know the difference between someone with a fast finger vs. auto fire.
I ripped the gun open thinking the disconnector was bad...it looks almost new.
It has about 1/16"-3/32" of positive engagement with the hammer, and positively engages the sear upon reset. Nothing is chipped/ worn.
The BCG is semi, the hammer is semi, the selector is semi, the disconnector is milled to be semi, the trigger is auto style. I couldn't find ANYTHING wrong inside the gun.
I'm stumped...anyone have any idea how could something like this could happen?


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