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Question on three round burst triggers.

Federal law defines a machine gun to include conversion sets and full auto parts that would easily turn s semi-auto into a full auto or burst fire.
Whether a Tri-burst gear and 3-position selector switch gets you there (to an NFA violation, a federal felony) without also having the sear, I don't know. But it's a serious issue to consider.
 
Remember, ATF doesn't say that a gun has to work reliably and safely as a machine gun to be classified as such. If the gun slam-fired with the hammer following the bolt forward, it still counts, as dangerous as it may be.
 
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