AR-15 Zero™ Trigger – Curved

$204.99$254.99

Trigger Weight
Internal Component Finish

Frequently Bought Together

Anti-Walk Trigger Pins

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AR-15 Zero™ Trigger - Curved

Zero™ triggers are the only triggers on the market that allow users to tune the trigger tail to the safety.  They are also the only triggers on the market with arc welded pull-weight and disconnector set screws for a lifetime of use without the loosening or failing of parts.

The bottom of the Zero™ trigger housing features threaded holes that straddle both the front and rear of the trigger tail.  Hardened set screws are provided and can be installed through these threaded holes to finely tune the trigger location and push it into contact with the safety.  The trigger tail shape is also modified to cup the safety drum.  This patent-pending design allows for fine tuning that eliminates any take-up or over-travel.

The trigger, hammer, and disconnector are also EDM cut and then polished with brass wire to a micron finish in all critical contact areas for a friction-less engagement.  The trigger’s reset is both short and positive to facilitate faster shooting during training or competition.

Zero™ AR-15 triggers are available in two pull weights:  3 lbs and 4.5 lbs.  They are also available in two finish options for the internal components (trigger, hammer, and disconnector):  Black Nitride and NP3.  Black Nitride is a heat treatment process that enhances corrosion resistance, improves lubricity, and leaves a fine black finish on the surface of the metal.  NP3 is a plating of electroless nickel co-deposited with Teflon that provides remarkable lubricity and takes on the appearance of the base metal.

In short, all of the features of the Zero™ trigger are designed to offer a shooting experience that is exceptionally smooth, crisp, and fast.

*ANTI-WALK TRIGGER PINS ARE NOT INCLUDED BUT CAN BE PURCHASED HERE

*0.1540 inch diameter trigger pins are required. Undersized and out-of-spec trigger pins will cause the trigger to malfunction.

*NOT Compatible with AR-10 or Pistol Caliber Carbines.

Read Will P’s review at The Firearm Blog.


Features
  • Single stage drop in trigger for AR-15
  • Short reset design
  • Fits any MIL-SPEC AR-15 lower receiver
Specifications
Trigger pull weight:
3 or 4.5
Shoe profile:
Curved
Trigger material:
A2 Tool Steel
Trigger finish:
Black Nitride or NP3
Disconnect material:
A2 Tool Steel
Disconnect finish:
Black Nitride or NP3
Hammer material:
S7 Tool Steel
Hammer finish:
Black Nitride or NP3
Housing material:
Aerospace Grade Aluminum
Housing finish:
Black Anodize
Installation
Watch Video PDF Instructions


Videos




Frequently Asked Questions

To clean the ZERO trigger when the trigger is outside the rifle, we recommend using camp fuel or white gas. Fully soak your trigger inside a small container of white gas for about 5 minutes. Make sure the container is covered or has a lid. Use clean cotton patches to wipe off all carbon deposits from hammer, disconnector, and trigger.

To clean the ZERO trigger when the trigger is inside the rifle, we recommend using camp fuel or white gas. Place your lower receiver upside down where the hammer faces the workbench. Use a small squeeze bottle to squeeze white gas into the trigger. Repeat this step a few times until all surfaces inside the trigger housing are wet. Without any delay, rotate your receiver and use clean cotton patches to wipe off all carbon deposits from the hammer, disconnector, and trigger. Repeat this process until the carbon deposit is removed from the trigger.

If you chose to use lubrication after cleaning (not recommended), we suggest Hoppe's 9 Lubricating Oil (Model 30128). Only add two drops of oil between the hammer and trigger where the hammer spring is located.

All ZERO triggers are lubricated during assembly. We use Hoppe's 9 Lubricating Oil (Model 30128). This is the only time we add lubrication to the triggers. After you install your trigger into your rifle, we recommend that you not use any additional lubrication. All ZERO triggers are designed to function without lubrication (i.e., run dry). If you choose to run our trigger with lubrication, you must clean your trigger more often.

If you run your trigger dry, as recommended, you should clean your trigger every 800-1200 rounds, depending on the quality of the ammunition you run.
If you elect to lubricate your trigger, you should clean your trigger every 500-900 rounds, depending on the quality of the ammunition you run.

No, the AR-15 ZERO trigger is not designed to function with common AR-10 ammunition, which requires a heavier hammer. For use in an AR-10, please choose our AR-10 ZERO trigger.

No, the AR-15 ZERO trigger is not designed to function with common PCC ammunition.

The trigger pull weight is the amount of force that is required to release the hammer, which causes the weapon to fire. If you are an experienced or competition shooter, we recommend our 3lb trigger. If you are a less experienced shooter or intend to use this trigger in a duty or defense weapon, we recommend our 4.5lb trigger. As with any trigger, we recommend that you routinely train with your trigger of choice.

Both finishes are excellent, but the processes are very different and offer different benefits.

Black nitride is a heat treatment process that enhances corrosion resistance, improves lubricity, and leaves a fine black finish on the surface of the metal. Black nitride processing can reduce the hardness of the base metal by about 5 HRC, but it does not create any dimensional changes. Before black nitride processing, we heat treat (in house) our trigger parts to the maximum possible hardness—about 60-65 HRC for both A2 and S7 tool steel. The 5 HRC reduction caused by the black nitride processing is nominal and will not have any meaningful impact on the life of the trigger.

Nickel Teflon (comparable to NP3) is a plating of electroless nickel co-deposited with Teflon that provides remarkable lubricity and takes on the appearance of the base metal. Nickel Teflon application, does not involve heat and therefore does not reduce the HRC of the base metal, but it does create dimensional changes because it is a coating that is adhered to the base metal. Our trigger design accounts for these miniscule dimensional changes, and we also lightly sandblast the trigger parts before nickel Teflon processing to improve adhesion of the coating and to also offset its thickness.

The most impactful difference between the black nitride and nickel Teflon finishes is that nickel Teflon offers about 3x the lubricity—specifically, nickel Teflon offers a coefficient of friction of .1 (lower is better) whereas black nitride offers a coefficient of friction of .3. This results in a trigger with a smoother feel, which may make a difference for experienced and competition shooters.

We use full strength springs for all of our triggers.

It is a common misconception that the length of the spring legs across the trigger housing will affect the spring force. Our springs are full strength springs with have short legs that do not interfere with the installation of the trigger in the receiver housing.