Franklin Armory BFSIII Binary Trigger for HK-C1 (SP5, MP5, 91/93) - Used; Excellent Condition
Guns International #: 103611227 Seller's Inventory #:
Category: Gun Parts - Rifle - Triggers - Gun Parts - Rifle

Seller's Information
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Verified Seller
Seller: PortersPawn
Company: Porter's Pawn
Member Since: 11/20/25
State: Arkansas
Zip: 72653
Country: United States
Phone: (870) 424-7296
Platinum Seller
Number of Active Listings: 88
Total Number of Listings: 265
Seller: FFL Dealer
Return Policy: 3 day inspection and return policy on used guns.
Factory New Premium Rifles Ship Free to Lower 48 States.
Payment Types Accepted: Credit and Debit Cards, Cash (in person), Money Orders, Checks (Via ACH),

About Us: For over 30 years, Porter's Firearms has been the trusted choice for shooters of all experience levels. We offer an extensive selection of both premium new rifles and quality used firearms, ensuring there's something for every hunter and budget. Our expert staff provides personalized service for custom builds, optics selection, and complete rifle systems. Take advantage of flexible layaway plans and free shipping on premium rifles to the lower 48 states. From your first scope to a premium rifle system setup, we're here to help you shoot with confidence.


Description:
Franklin Armory BFSIII Binary Trigger for HK-C1 (SP5, MP5, 91/93) - Used; Excellent Condition
Franklin Armory BFSIII – Binary® Trigger for HK Platforms
For sale is a Franklin Armory BFSIII Binary® Trigger designed for HK-C1 platforms including HK 91, HK 93, MP5 variants, SP5, and clones. This used trigger is in excellent condition and includes the ambi-selection lever, wrench, and trigger mechanism. Pull weight is approximately 4.5 lbs.
The BFSIII trigger system offers three positions:
  • Position 1 – Safe: Will not fire.
  • Position 2 – Semi: Fires 1 round per pull (standard semi-automatic).
  • Position 3 – Binary®: Fires 1 round on pull and 1 round on release.
The release round can be canceled by simply moving the patented selector out of Binary® mode while holding the trigger back. The ambidextrous safety selector will fit in most two and three-position trigger housings. This trigger works in SP5K housings as well.
Note: Trigger housing, ejector, ejector pin, and ejector spring are not included. Some firearms may require additional fitting. No warranty is available on this trigger as it is being sold used.
Specifications
  • Manufacturer: Franklin Armory
  • Model: BFSIII Binary® Trigger – HK-C1
  • Compatibility: HK 91, HK 93, MP5 variants, SP5, SP5K, and clones
  • Trigger Pull Weight: Approximately 4.5 lbs
  • Selector Positions: 3-Position (Safe / Semi / Binary®)
  • Safety Selector: Ambidextrous
  • Condition: Used; Excellent
  • Includes: Ambi-Selection Lever, Wrench, Trigger Mechanism
  • Not Included: Trigger housing, ejector, ejector pin, ejector spring
  • Warranty: No warranty – sold as-is
What's Included
  • Franklin Armory BFSIII Binary® Trigger Mechanism
  • Ambidextrous Safety Selector Lever
  • Installation Wrench
  • Note: Trigger housing, ejector, ejector pin, and ejector spring are NOT included.
BFSIII Binary® Trigger Features
  • Binary® Firing Mode: Fires one round on trigger pull and one round on trigger release, enabling rapid, controlled fire rates.
  • Cancelable Release Round: Simply move the selector out of Binary® mode while holding the trigger back to cancel the release round.
  • Ambidextrous Safety Selector: Fits most two and three-position trigger housings for left- or right-handed use.
  • HK Platform Compatibility: Designed specifically for HK 91, 93, MP5, SP5, SP5K, and clone variants.
  • Approximate 4.5 lb Pull Weight: Clean, consistent trigger pull.
  • Patented Design: Franklin Armory's revolutionary trigger system is legally classified as semi-automatic while offering unmatched performance.
Important Installation & Safety Information
  • NEVER ALTER ANY COMPONENT OF THE BFSIII®. Improper installation, use, or tampering may lead to unintentional discharge of the firearm that may lead to injury or even death.
  • By purchasing this product, you are accepting responsibility and liability for the serviceability of the final installation.
  • Some trigger housings may require additional fitting. We recommend fitting be performed by a Professional Gunsmith or a Franklin Armory Certified Armorer.
  • After the BFSIII® has been properly installed, it is imperative that all users seek qualified training on how to use these products.
  • Please ensure this item is legal to own in your state before ordering.
  • No warranty is available on this trigger as it is being sold used.
Condition Details
  • Overall: Excellent condition with minimal signs of use.
  • Trigger Mechanism: Functions correctly, pull weight consistent.
  • Ambidextrous Selector Lever: Clean, no damage.
  • Wrench: Included and functional.
  • No Warranty: Sold as-is; no returns due to the nature of the product.
Legal Compliance
Please verify that Binary® triggers are legal in your state, county, and city before purchasing. Franklin Armory BFSIII triggers are legal in many states but may be restricted in others. The buyer assumes all responsibility for compliance with local, state, and federal laws.
All listings are available for purchase in-store; please place ato ensure this item is pulled from the showroom. See photos for details, and contact us if you have any questions!

SOLD