Duty Triggers and the Law: Where the Four-Pound Rule Really Comes From

Ask a room of shooters what the legal minimum trigger pull is and half will say four pounds, some will say five, and a few will name a state. All of them are wrong. No federal law and no state law sets a minimum trigger pull weight for a civilian rifle, and the numbers people quote come from somewhere else entirely: police and military policies, manufacturer specifications and the arguments of civil lawyers. This page explains where the rules actually come from, what a duty trigger is built to survive, what the law does regulate, and how the rifles in this catalogue reach a dealer.

What the law regulates

Federal law regulates the receiver of a firearm and prohibits any part designed to make a semi-automatic fire more than one round per function of the trigger. A trigger that fires one round per press, at any weight, is an ordinary part. It ships to your door in every state, needs no paperwork and installs in a rifle you own without a record. Every trigger in this catalogue is a conventional single-shot-per-pull group from a recognised maker; we do not sell, list or source any part that changes that. A few states with feature-based rifle restrictions mention fire-control features in their definitions, and a handful ban specific unconventional designs; none restricts a conventional duty trigger.

Where the four-pound rule comes from

The military specification for the M16 and M4 family calls for a trigger pull between five and a half and nine and a half pounds, which is where the mil-spec trigger's range comes from. Police agencies that adopted patrol rifles wrote policies around that specification, often setting a floor of four or four and a half pounds for department rifles and five to six for duty pistols. Manufacturers then built enhanced duty triggers to sit at four and a half pounds because that is what the policies bought. None of it is law; it is procurement. A civilian may fit a two-pound trigger to a rifle and be entirely within the law in every state.

Liability and the civil courtroom

The other source of the myth is the civil case. When a shooting is litigated, a plaintiff's lawyer may argue that a modified, light trigger shows recklessness or made an unintended discharge more likely, and a jury that knows nothing about triggers may find that persuasive. That is an argument about how a jury will see you, not about legality, and it is why instructors advise keeping a rifle that may be used defensively at a factory-like weight with an unmodified appearance: an enhanced duty trigger at four and a half pounds, not a competition trigger at two. Reasonable people differ on how much weight to give the argument; the trigger you can control under stress is the safer choice either way.

What a duty trigger has to survive

A duty trigger is specified to work after months in a rack, in dust, mud and freezing rain, with gloves, on hard military primers, and after being dropped. That means a full-power hammer spring, a deep sear engagement that does not release when the rifle is bumped, corrosion-resistant coatings, chamfered parts that shed grit, and no adjustment screws that can back out. The weight is the visible result of those choices; the reliability is the point. The enhanced mil-spec guide explains how the good makers keep all of that at four and a half pounds without the grit.

State rules that touch triggers

A few states with feature-based rifle restrictions mention fire-control features in their definitions, and a handful ban specific unconventional trigger designs by name. None of them restricts a conventional single-shot-per-pull duty trigger, and none sets a weight. In the states we ship to most, Texas, Florida, Georgia, Tennessee and the rest, the trigger is simply a part. Our checkout holds every order to what may lawfully be delivered to the address given, so if a state ever restricts an ordinary trigger the item will be removed before payment rather than shipped and seized.

Modifying a trigger yourself

Installing, swapping and replacing springs are lawful and ordinary. Filing or stoning sear surfaces is lawful too, and it is how a rifle that fires more than one round per press is usually created, by accident, in a home workshop. A rifle in that condition is no longer a semi-automatic rifle in the eyes of the law and cannot lawfully be fired or kept as it is; the fix is a new trigger group, and the maintenance guide explains how to inspect for the wear that leads there.

Department rifles and personally owned rifles

An officer who carries a personally owned rifle on duty is bound by the department's policy, which usually specifies the trigger weight and sometimes the exact trigger. A civilian is bound by nothing but the law, which is silent, and by their own judgement. The advice on this site is the same for both: for a rifle that may be fired at a person, four to five and a half pounds, a clean break, a full-power spring and no screws.

Rifles and lowers in the catalogue

The complete rifles and lower receivers we sell beside the triggers are firearms and ship to the licensed dealer you name at checkout. You complete ATF Form 4473 there and pass a background check; a rifle may go to a buyer of 18 or older where the state allows and a stripped lower to a buyer of 21 or older. Florida adds a waiting period, Pennsylvania runs its own check, and several states outside our footprint restrict AR-pattern rifles by feature; the checkout holds every order to what a dealer in the destination state may lawfully transfer, and the city pages summarise each state.

What ships to your door

• Duty, enhanced mil-spec and standard trigger groups, hammers, disconnectors, springs and pins.
• Reduced-power and full-power spring kits, anti-walk pins, selectors and grips.
• Complete uppers, barrels, bolt carriers and cleaning supplies.
• Magazines, where your state does not cap capacity below the magazine's.

The budget guide covers what the price buys, and the reliability guide covers the conditions. Browse duty triggers and rifles in the catalogue.

General information, not legal advice. Current as of September 2026. Laws change; check the official source before you act.