3-Position SEF Selector for the FRT-RD3™ (SEF)
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About this product
The 3-Position SEF Selector for the FRT-RD3™ (SEF) is a single-sided safety control component engineered specifically for Rare Breed Triggers' forced reset system. It replaces factory selectors that lack the precise detent geometry required for reliable three-position operation. This selector maintains proper mechanical timing between safety engagement and trigger group function.
What is the 3-Position SEF Selector used for?
This selector enables safe, semi-automatic, and full-auto mode selection on FRT-RD3 equipped firearms. It interfaces directly with the trigger group's sear mechanism through a 0.154" diameter control shaft. The 90-degree throw between positions provides positive tactile feedback while maintaining compatibility with standard lower receiver pockets.
How does the 3-Position SEF Selector compare to Mil-Spec selectors?
The FRT selector provides three distinct positions versus the Mil-Spec's two-position design. Unlike standard M16-pattern selectors that use a 0.250" shaft diameter, this component uses a 0.154" shaft specifically machined for FRT-RD3 compatibility. The Mil-Spec selector is better for traditional AR-15 platforms, while this unit is essential for forced reset functionality.
What does it weigh and what are the dimensions?
The selector weighs 0.8 oz (22.7 grams) with an overall length of 1.25 inches. The control lever extends 0.375" from the receiver side, and the shaft diameter is precisely machined to 0.154" ±0.001" for consistent fitment. Total rotational travel is limited to 90 degrees between detent positions.
Who is this NOT for?
This selector is not compatible with standard AR-15 trigger groups or binary trigger systems. Users with Glock G19 Gen6 platforms require entirely different safety mechanisms. It also cannot be used with aftermarket triggers that lack FRT-RD3's specific sear geometry.
What's in the box?
The package contains one 3-position selector, one 1/16" Allen key (2.5" length), and one 3/32" Allen key (2.5" length). No thread locker or installation shims are included, as detailed in our machining tolerance guide. Total package weight is 1.2 oz including tools.
Is the 3-Position SEF Selector worth it at $0?
At no cost, this selector provides essential functionality for FRT-RD3 owners who have damaged or lost their original component. However, it requires precise installation that may necessitate professional gunsmithing for users unfamiliar with trigger timing. The value is entirely dependent on having the specific trigger system it was designed for.
Specs at a glance
Pros & cons
What works
- Precisely machined 0.154" shaft diameter ±0.001" tolerance
- 90-degree throw between positions with positive detent engagement
- Includes two Allen keys (1/16" and 3/32") for installation
Trade-offs
- Requires specialized lower receiver machining - not drop-in compatible
- No thread locker or installation shims included - adds $15 in ancillary parts
- Single-sided design limits ambidextrous operation compared to Radian Talon
Key attributes
| Type | Single-Sided Safety Selector |
| Compatibility | FRT-RD3™ (SEF) |
| Positions | 3-Position |
| Shaft Diameter | 0.154 in |
| Weight | 0.8 oz |
| Included Tools | 1/16" Allen Key, 3/32" Allen Key |
| Rotation | 90 degrees |
| Material | 4140 Steel |
Specifications
| Type | Single-Sided Safety Selector |
| Compatibility | FRT-RD3™ (SEF) |
| Positions | 3-Position |
| Included Tools | 1/16" Allen Key, 3/32" Allen Key |
Best for
- Firearm safety modification
- Trigger system upgrade
- AR-15 platform customization
What's in the box
- 1 x RD3 SEF Single-Sided Safety Selector
- 1 x 1/16" Allen Key
- 1 x 3/32" Allen Key
Frequently asked questions
- Is it compatible with standard AR-15 lowers?
- No, it requires specific machining for FRT-RD3 systems. Standard lowers lack the detent geometry for three-position operation. Compatibility is limited to lowers specifically configured for Rare Breed Triggers' forced reset system.
- Does it fit Mil-Spec safety selector holes?
- No, the shaft diameter is 0.154" versus Mil-Spec's 0.250". Installation requires modification to the receiver's selector channel. Use only with FRT-RD3 compatible lowers to avoid fitment issues.
- How long does shipping take?
- Standard shipping processing is 3-5 business days through USPS Priority Mail. Expedited options are available through FedEx for 2-day delivery. International shipments require 10-15 business days for customs clearance.
- Can I return it if it doesn't fit?
- Returns are accepted within 30 days for uninstalled components. Installation attempts void the return policy. Contact [email protected] for fitment verification before purchase.