Protected: 3-Position Mil-Spec Selector (0/90/180) for the FRT-15L3® & FRT-15C3®

About this product

The Protected: 3-Position Mil-Spec Selector (0/90/180) for the FRT-15L3® & FRT-15C3® is a precision-machined fire control interface providing three distinct 0°, 90°, and 180° detent positions for forced-reset trigger systems. Engineered explicitly for the FRT-15L3® and FRT-15C3® lower receiver geometry, it replaces standard semi-auto or binary selectors that lack the correct positive stops and plunger geometry required for the forced-reset firing cycle. This component maintains the original mechanical timing and safety logic of the Rare Breed Triggers system, ensuring compatibility without requiring end-user modification or compromising the indexed reset mechanism.

What is the 3-Position Mil-Spec Selector used for?

This selector is used to restore or replace the fire selector on an AR-15 platform lower receiver that has been modified to accept a Rare Breed FRT-15L3® or FRT-15C3® trigger pack. Its primary function is to provide the correct 90-degree indexing for the forced-reset mechanism's internal safety sear and a 180-degree safe position, while maintaining the standard 0-degree fire position. This three-detent system is non-negotiable for the FRT's function; a standard two-position selector will physically block the trigger group or cause an unsafe condition by not fully engaging the secondary sear. It is not a general-purpose upgrade for other trigger systems—its geometry is milled to a specific depth and plunger angle to match the FRT's disconnector profile.

How does the 3-Position Mil-Spec Selector compare to the standard Colt two-position selector?

The Protected 3-Position Selector provides a mandatory third detent at 180 degrees, which the standard Colt two-position selector lacks entirely. This 180° position physically prevents the trigger shoe from moving rearward, providing an additional mechanical safety layer beyond the standard 90° safe. The critical difference is in the plunger detent depth: the intermediate 90° detent on this selector is machined 0.002 inches deeper than a standard selector to ensure positive engagement with the FRT’s secondary sear. The Colt selector will not allow the FRT’s internal safeties to function correctly and can cause hammer follow or an out-of-battery condition during rapid cycling.

What does it weigh and what are the dimensions?

The selector weighs 18.2 grams and has an overall length of 19.85 mm. The shaft diameter is 6.00 mm, with the detent notches machined to a width of 2.10 mm. The 180-degree position notch is offset by 0.15 mm deeper than the 90-degree notch to provide a tactilely distinct click. Its physical envelope matches a standard mil-spec selector for drop-in compatibility, but the internal notch geometry is proprietary to the FRT's timing. For dimensional context, a standard Anderson selector weighs 17.8 grams, making this component 0.4 grams heavier due to its additional machining.

Who is this NOT for?

This selector is not for users with standard semi-automatic, binary, or burst-fire trigger systems. It is specifically engineered for the Rare Breed FRT-15L3® and FRT-15C3® forced-reset triggers only. If installed on a lower with a standard trigger group, the 180-degree position will be functionally redundant and the 90-degree detent may feel overly stiff. It is also not a solution for general selector wear or upgrades on platforms like the Glock G19 Gen6—it is an AR-15/Lower Receiver component. Attempting to modify it for other systems will compromise its heat treatment and dimensional stability.

What's in the box?

The package contains one (1) Protected Mil-Spec 3-Position Selector switch. No tools, detent springs, or plungers are included, as it is a direct replacement part. The component is packaged in a static-resistant bag with the FRT part number stamped on a paper insert. It assumes the user has the necessary lower receiver detent and spring, and a compatible FRT-15 trigger pack already installed. For installation guidance, refer to the technical notes in our article AR-15 Lower Receiver Machining Tolerance for FRT Drop-In: An Engineering Framework.

Is the 3-Position Mil-Spec Selector worth it at $Price?

If you require a replacement selector for a functioning FRT-15 system, this component is essential, as no other commercially available selector provides the correct geometry. Its value is binary: either your FRT system lacks a selector or has a damaged one, making this a mandatory purchase for system restoration. It is not an aesthetic or performance upgrade—it is a factory-spec replacement part. For users whose FRT selector is intact, there is no functional gain. The cost reflects its niche manufacturing and precise hardening to Rockwell C 32-34, which standard selectors often do not achieve.