Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3, with hands-on install experience on AR/AK/Glock platforms.
The Franklin Armory BFSIII ACR-C1 is a binary trigger assembly designed for the Bushmaster ACR rifle platform. A binary trigger fires one round when you pull the trigger and a second round when you release it, doubling your cyclic rate without converting the firearm to automatic fire. This is the third-generation Binary Firing System from Franklin Armory, built with a 3-position selector: safe, semi-automatic, and binary. The ACR-C1 variant is fitted specifically to the ACR trigger housing, with an ambidextrous safety selector and a design intended for drop-in installation, though some trigger housings require additional fitting by a professional gunsmith or Franklin Armory-certified armorer.
Installation Overview
The BFSIII ACR-C1 ships with all components required for installation in the Bushmaster ACR. Franklin Armory classifies this as a drop-in trigger, but the manufacturer explicitly states that some ACR trigger housings may require fitting. This is not a modification of the trigger itself — it refers to minor adjustments to the host firearm’s trigger pocket or pin holes to achieve proper function. We recommend professional installation. Do not attempt to alter any component of the BFSIII. Improper installation or tampering voids the warranty and may cause unintentional discharge. After installation, verify function with a cleared firearm before live fire, and seek qualified training on binary trigger operation before range use.
Technical Breakdown
| Spec | Value |
|---|---|
| Type | Binary (3-position selector) |
| Platform | Bushmaster ACR |
| Positions | Safe / Semi / Binary |
| Selector | Ambidextrous |
| Drop-in | Yes (fitting may be required) |
| Compliance | Not for sale in CA, CT, DC, DE, FL, HI, IA, IL, MA, MD, MN, NJ, NY, RI, WA |
| Manufacturer | Franklin Armory |
The binary mode delivers one round on pull and one on release, halving split times for tactical drills or competition stages that reward speed. This is the Gen 3 iteration of Franklin Armory’s Binary Firing System, covered by eight U.S. patents. The ambidextrous selector allows manipulation from either side of the receiver. This trigger is built for the binary trigger category and requires an ACR-pattern trigger housing.
Matching It to Your Build
The BFSIII ACR-C1 is for shooters running a Bushmaster ACR who want reduced split times without modifying the rifle into a select-fire platform. Competition shooters use binary triggers in divisions that permit them, and defensive trainers use them to simulate suppressive fire drills. This trigger is not legal for civilian purchase in California, Connecticut, Delaware, District of Columbia, Florida, Hawaii, Iowa, Illinois, Massachusetts, Maryland, Minnesota, New Jersey, New York, Rhode Island, or Washington. Verify current state and local law before ordering. If you are not confident in trigger installation, hire a gunsmith or Franklin Armory-certified armorer. No refunds are issued after installation has been attempted.
Safe Handling & Compliance
Per current ATF guidance, binary triggers are classified as semi-automatic trigger assemblies — each round fired requires a discrete trigger function, and the device does not convert a firearm to automatic fire. Regulatory status has changed before and may change again; verify current federal and state law before ordering.
- Follow the four rules of firearm safety: treat every firearm as loaded, never point at anything you are not willing to destroy, keep your finger off the trigger until ready to fire, and know your target and what is beyond it. NSSF safety rules.
- This trigger is restricted in CA, CT, DC, DE, FL, HI, IA, IL, MA, MD, MN, NJ, NY, RI, and WA. Verify state and local law in your jurisdiction before ordering.
- Never alter any component of the BFSIII. Improper installation or tampering voids the warranty and may cause unintentional discharge. Seek qualified training on binary trigger operation before live fire.
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