Davidson Defense AR-15 Ambidextrous Bolt Catch Lower Build Kit, Rare Breed FRT-15L3, SBA3 Black Adjustable Pistol Stabilizing Brace

Davidson Defense AR-15 Ambidextrous Lower Build Kit with Rare Breed FRT-15L3 Trigger and SBA3 Black Pistol Brace

This complete AR-15 lower build kit delivers ambidextrous functionality through a milled ambi bolt catch slot with included ambidextrous bolt catch kit and ambidextrous safety selector, paired with a forged 7075-T6 aluminum serialized lower receiver. The Rare Breed FRT-15L3 forced reset trigger provides faster follow up shots within legal semi automatic classification. The SB Tactical SBA3 adjustable pistol stabilizing brace provides proven SBA3 performance in black finish with five position adjustment. Built around black hardcoat anodized finish and complete Mil-Spec buffer components including an H3 carbine buffer, this kit supports left and right handed operation for AR-15 pistol platform builds requiring enhanced ambidextrous controls with industry standard SB Tactical brace reliability in traditional black.

Key Features

• Rare Breed FRT-15L3 forced reset trigger with three position ambidextrous safety selector covering safe, semi automatic, and forced reset modes
• Forged 7075-T6 aluminum serialized lower receiver with milled ambidextrous bolt catch slot and black hardcoat anodized finish
• Ambidextrous bolt catch kit enables left and right handed bolt manipulation
• Ambidextrous safety selector allows fire control access from both sides of receiver
• SB Tactical SBA3 adjustable pistol stabilizing brace in black finish with five position adjustment
• Complete Mil-Spec buffer system including heavy duty six position carbine buffer tube, H3 carbine buffer at 5.5 oz, carbine recoil spring in spring steel, US Tactical phosphate receiver end plate, and castle nut
• Trigger constructed from 7075 anodized aluminum and heat treated 4140 steel with drop in duty grade installation

Perfect For

• AR-15 pistol builders seeking faster shooting dynamics through forced reset trigger technology with ambidextrous controls
• Left handed shooters requiring complete serialized lower with factory ambi features and adjustable brace
• Builders prioritizing weapon manipulation from either side with traditional black finish throughout
• Customizers wanting industry standard SB Tactical quality with heavy H3 buffer for suppressed or overgas pistol setups

FRT-15L3 Forced Reset Trigger System

The Rare Breed FRT-15L3 uses forced reset technology to automatically reset the trigger after each shot, allowing for faster follow up fire while requiring one trigger pull per round. The system includes a three position ambidextrous safety selector covering safe, semi automatic, and forced reset modes. Constructed from 7075 anodized aluminum and heat treated 4140 steel, the trigger features drop in duty grade design for secure installation. This trigger requires a full auto compatible bolt carrier group for proper function.

Dual Ambidextrous Control System

The lower receiver features a milled ambidextrous bolt catch slot that accepts the included ambidextrous bolt catch kit, allowing both left and right handed shooters to manipulate the bolt catch and release without shifting grip or reaching across the firearm. The ambidextrous safety selector extends this left and right handed functionality to fire control, enabling shooters to engage or disengage the safety from either side of the receiver. This dual ambidextrous configuration supports complete weapon manipulation regardless of shooter handedness or shooting position. The factory milled bolt catch slot eliminates the need for aftermarket machining or adapter components.

SB Tactical SBA3 Adjustable Pistol Stabilizing Brace

The SB Tactical SBA3 adjustable pistol stabilizing brace is one of the most widely adopted braces in the AR-15 pistol market, delivering proven reliability in black finish. Five position adjustment accommodates different arm lengths and shooting positions while maintaining the lightweight profile SB Tactical is known for. The brace interfaces with Mil-Spec carbine buffer tubes for consistent fit across AR-15 pattern firearms. SB Tactical's reputation for quality control and consistent manufacturing standards makes the SBA3 a trusted choice for AR-15 pistol builds requiring adjustable positioning with proven performance. The black finish provides a cohesive appearance when paired with the black lower receiver and buffer components.

Complete Buffer System and Lower Components

This kit includes a Mil-Spec heavy duty six position carbine buffer tube in aluminum, AR-15 H3 carbine buffer weighing 5.5 oz, AR-15 carbine recoil spring in spring steel, US Tactical Mil-Spec receiver end plate with phosphate finish for corrosion resistance, and castle nut in black. The H3 buffer weight helps manage recoil impulse and can support suppressed configurations or setups with adjustable gas blocks. The heavier buffer weight provides additional mass for reliable cycling with forced reset trigger systems. The Davidson Defense lower receiver is forged from 7075-T6 aluminum with black hardcoat anodized finish for protection against wear and corrosion. The receiver is serialized and ready for federal firearms transfer through a licensed dealer. The AR-15 lower parts kit includes all internal components needed for lower function along with ambidextrous safety selector.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. The Rare Breed FRT-15L3 trigger requires a full auto compatible bolt carrier group for proper function. Lower receiver is serialized and subject to federal firearms transfer requirements through a licensed dealer. Verify compatibility of ambidextrous bolt catch with your specific upper receiver and bolt carrier group before installation. Verify current federal and state regulations regarding forced reset trigger systems before purchase. Pistol stabilizing braces are subject to federal and state regulations that may change. Verify current regulations in your jurisdiction before use. Trigger guard style may vary depending on current inventory.