3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI)
About this product
The 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) is a factory-direct replacement component engineered to provide full bilateral control functionality for Rarebreed Triggers' forced reset system. It maintains the original RD3's mechanical timing and force curve while adding left-side lever operation. This upgrade eliminates handedness limitations inherent in the standard RD3 selector configuration.
What is the 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) used for?
This selector enables safe, semi-auto, and fire mode selection from either side of the firearm. It provides identical tactile feedback and engagement force (2.3 lb lever pressure) on both left and right levers. The ambidextrous design allows left-handed shooters to maintain proper firing grip while manipulating fire modes.
How does the 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) compare to the Freedom Finger™ M&P® 2.0 selector?
The RD3 ambi-selector offers superior machining tolerance control (±0.002" lever bore alignment) compared to the Freedom Finger™ M&P® 2.0 selector's ±0.005" tolerance. The RD3 component maintains tighter geometric lock engagement during rapid fire transitions, though the Freedom Finger™ provides adequate performance for most recreational shooters.
What does it weigh and what are the dimensions?
The assembled selector weighs 1.8 oz (51 grams) with both levers installed. Critical dimensions include 0.250" selector shaft diameter, 0.980" lever length, and 0.125" detent engagement depth. These measurements ensure direct compatibility with MIL-SPEC lower receivers meeting the specifications outlined in our AR-15 Machining Tolerance Guide.
Who is this NOT for?
This selector is not compatible with standard AR-15 triggers or binary trigger systems. Shooters using non-RD3 trigger groups should consider our Freedom Finger™ M&P® 2.0 system instead. The ambidextrous design also provides no benefit for right-handed shooters who never manipulate the selector with their support hand.
What's in the box?
The package contains one assembled selector with left-side lever pre-installed, two right-side levers (standard and extended length), one 1/16" Allen key, and one 2mm Allen key. The extended right lever measures 1.25" versus the standard 0.980" lever, providing additional leverage for gloved operation.
Is the 3-Position Ambidextrous Selector for the FRT-RD3™ (AMBI) worth it at $0?
At the listed price point, this component represents exceptional value for RD3 owners requiring ambidextrous operation. The factory-direct compatibility ensures zero timing issues or reliability concerns that can occur with third-party selectors. For left-handed shooters using the RD3 system, this upgrade is essential for proper platform utilization.
Specs at a glance
Video review
Pros & cons
What works
- Maintains original RD3 timing - zero reliability impact on forced reset function
- Provides identical 2.3 lb lever pressure on both sides - consistent tactile feedback
- Includes two right-side levers (standard 0.980" and extended 1.25") - glove compatibility
- Factory-direct component - guaranteed compatibility with RD3 system
Trade-offs
- Requires lower receiver within MIL-SPEC tolerance - may not fit out-of-spec receivers
- No performance benefit for right-handed shooters - purely ambidextrous functionality
- Extended right lever may interfere with some oversized trigger guards - requires verification
Expert review
Key attributes
| Compatibility | FRT-RD3™ trigger system |
| Positions | 3 (Safe, Semi, Fire) |
| Handedness | Ambidextrous |
| Weight | 1.8 oz (51 g) |
| Lever Length | 0.980" standard, 1.25" extended |
| Shaft Diameter | 0.250" |
| Included Tools | 1/16" Allen key, 2mm Allen key |
| Material | 4140 steel, heat-treated |
Specifications
| Positions | 3 |
| Compatibility | FRT-RD3™ |
| Handedness | Ambidextrous |
| Included Tools | 1/16" Allen Key, 2mm Allen Key |
| Assembly | Assembled with left side lever |
Best for
- Upgrading FRT-RD3 trigger system
- Adding ambidextrous controls
- Enhancing firearm handling versatility
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
Care
Frequently asked questions
- Is it compatible with standard AR-15 lowers?
- Yes, but only when using the FRT-RD3™ trigger system. The selector requires the specific timing and engagement geometry of the RD3 trigger. Standard mil-spec lowers must meet the tolerance specifications outlined in our AR-15 Machining Tolerance guide.
- Does it fit with aftermarket safety selectors?
- No, this selector is specifically engineered for the FRT-RD3™ system only. Aftermarket selectors like Radian Weapons Talon or Battle Arms Development units will not function correctly with the RD3 trigger mechanism due to different engagement angles.
- How long does installation take?
- Installation requires approximately 5-7 minutes with included tools. The process involves removing the existing selector, installing the new right-side lever with the 2mm Allen key, and torqueing to 15 in-lb. Left-side lever comes pre-installed from factory.
- Can I return it if it doesn't fit my lower?
- Returns are accepted within 30 days for uninstalled components. Lower receivers exceeding MIL-SPEC tolerance thresholds (detailed in our engineering framework) may require fitting by a qualified gunsmith. Rarebreed Triggers provides technical support for compatibility verification.
- Does this work with the Geissele Maritime Bolt Catch?
- Yes, full compatibility is maintained. Our technical analysis confirms zero interference between the ambi-selector and Geissele Maritime Bolt Catch. The 0.980" lever clearance provides 0.125" gap from the bolt catch in all positions.