Davidson Defense AR-15 Ambidextrous Bolt Catch Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, Heavy-Duty 6-Position Carbine Buffer Tube

Davidson Defense AR-15 Ambidextrous Lower Build Kit with Rare Breed FRT-15L3 Flat Trigger and Heavy Duty Carbine Buffer Tube

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 flat trigger provides forced reset technology for faster follow up shots within legal semi automatic classification. The Mil-Spec heavy duty six position carbine buffer tube with H3 carbine buffer provides a foundation for AR-15 rifle builds without an attached stock. Built around black hardcoat anodized finish and complete buffer components, this kit supports left and right handed operation for AR-15 platform builds requiring enhanced ambidextrous controls with performance oriented trigger systems and flexibility for custom stock selection.

Key Features

• Rare Breed FRT-15L3 flat trigger with forced reset technology, three position ambidextrous safety selector, and drop in installation using anti walk trigger pins
• 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
• Mil-Spec heavy duty six position carbine buffer tube in aluminum with H3 carbine buffer at 5.5 oz
• Complete buffer system including 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 flat profile and ambidextrous operation

Perfect For

• AR-15 rifle 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 performance trigger
• Builders prioritizing weapon manipulation from either side with flexibility to select their own stock
• Customizers wanting ambidextrous functionality with heavy H3 buffer for suppressed or overgas rifle 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 flat trigger profile provides consistent finger placement across all shooting positions. Anti walk trigger pins are included for secure drop in 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.

Heavy Duty Carbine Buffer Tube with H3 Buffer

The Mil-Spec heavy duty six position carbine buffer tube is engineered from aluminum for durability and consistent performance. This configuration allows builders to select their preferred carbine stock separately based on individual preferences for adjustability, weight, storage features, or specific mounting options. The six position design accommodates a wide range of Mil-Spec compatible carbine stocks from various manufacturers. The included H3 carbine buffer weighing 5.5 oz 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.

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 structural integrity, and castle nut in black. All buffer components meet Mil-Spec dimensional standards for consistent function across AR-15 pattern firearms. 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. This kit does not include a stock or brace. Trigger guard style may vary depending on current inventory.