Drop In Auto Sear Keychain !exclusive! 〈500+ Free〉

It trips the hammer when the bolt is fully in battery.

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is a small, precision-engineered part that bypasses this cycle. When "dropped" into a compatible semi-automatic receiver (most commonly an AR-15), it trips the sear automatically as the bolt carrier moves forward into battery. This allows the firearm to fire continuously as long as the trigger remains depressed, effectively converting a civilian rifle into a fully automatic machine gun. The "Keychain" Controversy and Legal Reality It trips the hammer when the bolt is fully in battery