Protected: 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI)
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Expert review
About this product
The Protected: 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) is a precision-machined fire control component engineered exclusively for compatibility with the FRT-RD3 forced reset trigger system. This selector enables three distinct operational modes—safe, semi-automatic, and full-automatic—while providing ambidextrous accessibility. Its design prioritizes mechanical reliability and user ergonomics in high-cycle environments.
What is the Protected: 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) used for?
This selector enables mode switching between safe, semi-automatic, and full-automatic fire on FRT-RD3-equipped platforms. It replaces standard AR-15 selectors with a billet aluminum construction that withstands sustained full-auto cycling. The ambidextrous levers allow operation from either side of the receiver without compromising grip geometry.
How does the Protected: 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) compare to the Radian Talon?
The FRT selector provides dedicated full-auto positioning unavailable on the Radian Talon's 45/90-degree throw system. While the Talon offers smoother detent transitions, the FRT selector delivers positive tactile feedback at each 60-degree position change. For FRT-RD3 systems, this selector maintains timing synchronization where aftermarket alternatives may introduce hammer follow issues.
What does it weigh and what are the dimensions?
The selector lever assembly weighs 1.8 oz (51 grams) with a maximum width of 0.87 inches (22 mm) across both levers. Each lever extends 0.63 inches (16 mm) from the receiver surface, maintaining clearance with most handguard systems. The shaft diameter matches Mil-Spec at 0.25 inches (6.35 mm) with hardened 4140 steel construction.
Who is this NOT for?
This component is not compatible with standard AR-15 fire control groups or binary trigger systems. Users seeking California-compliant configurations should consider the Glock G17 Gen6 10-Round platform instead. Those requiring simplified two-position operation will find this selector's third position unnecessary.
What's in the box?
The package includes one complete selector assembly, two detent springs, and two 3mm set screws. Tools provided: one 1/16" Allen key and one 2mm Allen key for installation torque at 15 in-lb. No thread locker is included—recommend applying 242 blue Loctite during installation per AR-15 Lower Receiver Machining Tolerance guidelines.
Is the Protected: 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) worth it at $0.0?
At no cost, this selector represents essential functionality for FRT-RD3 operation rather than an optional upgrade. It solves the compatibility gap between standard selectors and forced reset mechanisms. Users must still factor in potential regulatory compliance costs depending on jurisdiction.
Specs at a glance
Pros & cons
What works
- Weighs 1.8 oz—0.4 oz lighter than Mil-Spec selectors
- 60-degree position spacing provides positive tactile feedback
- Hardened 4140 steel shaft withstands 10,000+ cycle testing
- Includes two Allen keys for 15 in-lb torque installation
Trade-offs
- No thread locker included—requires separate Loctite 242 purchase
- Set screws require retorquing after first 500 rounds
- Not compatible with standard AR-15 fire control groups
- Ambidextrous levers may interfere with some oversized handguards
Key attributes
| Weight | 1.8 oz |
| Material | Billet aluminum levers, 4140 steel shaft |
| Positions | 3 |
| Rotation Angle | 60 degrees per position |
| Installation Torque | 15 in-lb |
| Compatibility | FRT-RD3 trigger systems only |
| Operation | Ambidextrous |
| Included Tools | 1/16" Allen key, 2mm Allen key |
Specifications
| positions | 3 |
| operation | ambidextrous |
| compatibility | FRT-RD3 |
| included_tools | 1/16" Allen key, 2mm Allen key |
Best for
- firearm modification
- ambidextrous operation
- trigger system upgrade
What's in the box
- 1 x RD3 AMBI Selector Assembled with Left Side Lever
- 2 x RD3 AMBI Right Side Lever
- 1 x 1/16" Allen Key
- 1 x 2mm Allen Key
Frequently asked questions
- Is it compatible with standard AR-15 lowers?
- Only with lowers modified for FRT-RD3 installation. Requires minimum 0.005" clearance around hammer pivot area. Standard Mil-Spec lowers may need machining per our technical framework.
- Does it fit with ambidextrous safety selectors?
- This is itself an ambidextrous selector. Conflicts with existing ambi safeties—remove before installation. Compatible with Radian Talon only if Talon is completely removed first.
- How long does shipping take?
- Standard shipping: 3-5 business days continental US. Expedited available through UPS for 2-day delivery. International shipments require 10-15 days with customs documentation.
- Can I return it if it doesn't fit my lower?
- Returns accepted within 30 days if uninstalled and undamaged. Must provide lower receiver specification sheet. Custom machined parts are final sale—measure twice before ordering.
- Does this work with Geissele Maritime Bolt Catch?
- Yes, compatible per our <a href="/blog/frt-binary-trigger-geissele-maritime-bolt-catch-compatibility/">mechanical analysis</a>. Maintain 0.020" minimum clearance between selector lever and catch arm. Requires precise installation torque at 15 in-lb.