Are Forced Reset Triggers Legal in Missouri?

Missouri Revised Statutes section 571.010 defines a machine gun by automatic fire of more than one shot, without manual reloading, through a single trigger function. Missouri does not add a separate forced-reset-trigger or generic rate-of-fire-device definition.

That wording makes the number of shots produced by one trigger function the key state-law fact, while automatic conversion parts remain a distinct category.

Under the 2025 DOJ settlement with Rare Breed Triggers, an FRT fires one round per trigger function and is not an NFA machine gun federally. The settlement covers rifles and grip-forward pistols; it does not extend to grip-fed handguns (Glock, S&W M&P, Canik), whose federal FRT status remains less settled. State bans operate independently of federal law through broader state machine-gun, trigger-activator, or rate-of-fire definitions.

Scope: Forced reset triggers (Rare Breed FRT-15, Dairyland Defender, and similar) and forced-reset selectors (AR Super Safety, ARC-Fire). One round per trigger function. Binary triggers are a separate class.