DTT AR-15 Rifle Lower Build Kit, Rare Breed FRT-15L3, Mil-Spec Heavy-Duty Carbine 6-Position Buffer Tube

DTT AR-15 Rifle Lower Build Kit - Rare Breed FRT-15L3 Forced Reset Trigger and Mil-Spec Heavy-Duty Carbine 6-Position Buffer Tube

The DTT AR-15 Rifle Lower Build Kit combines a 7075-T6 aluminum mil-spec AR-15 lower receiver with the Rare Breed FRT-15L3 Forced Reset Trigger and a mil-spec heavy-duty 6-position carbine buffer tube. The lower features a Type III hardcoat anodized black finish, low shelf M16 cut trigger pocket, and ambidextrous pictogram markings. A full-auto compatible bolt carrier group is required for the FRT-15L3 and is not included. A stock is not included.

Key Features

• 7075-T6 aluminum AR-15 mil-spec pattern lower receiver
• Type III hardcoat anodized black finish
• Low shelf M16 cut trigger pocket
• Ambidextrous pictogram markings, Safe, Semi, and Full Auto, engraved on both sides
• Standard AR-15 and STANAG magazine compatible
• Rare Breed FRT-15L3 Forced Reset Trigger
• Three function modes: Safe, Semi, and Forced Reset
• Ambidextrous 3-position safety selector
• Drop-in design for mil-spec AR-15 lowers
• 7075 anodized aluminum and heat-treated 4140 steel trigger components
• Anti-walk pins and anti-rotation design
• Full-auto compatible BCG required, not included
• Mil-spec heavy-duty 6-position aluminum carbine buffer tube
• Sound Mitigation H3 buffer at 5.6 oz

Perfect For

• AR-15 rifle builders sourcing a lower build kit with a forced reset trigger and buffer tube without a stock
• Builders completing a standard mil-spec AR-15 lower receiver and sourcing their own stock separately
• Competitive shooters adding the Rare Breed FRT-15L3 to an AR-15 rifle build
• Builders looking for a buffer tube and H3 sound mitigation buffer to pair with their own stock selection

DTT AR-15 Lower Receiver

The lower receiver is 7075-T6 aluminum with a Type III hardcoat anodized black finish. It follows the AR-15 mil-spec receiver pattern with a low shelf M16 cut trigger pocket and standard AR-15 and STANAG magazine compatibility. The ambidextrous pictogram markings are engraved on both sides of the receiver for Safe, Semi, and Full Auto selector positions, serving as the serialized foundation for the build.

Rare Breed FRT-15L3 Forced Reset Trigger

The Rare Breed FRT-15L3 is a drop-in forced reset trigger built from 7075 anodized aluminum and heat-treated 4140 steel. It offers three function modes through the ambidextrous 3-position safety selector: Safe, Semi, and Forced Reset. Anti-walk pins and an anti-rotation design secure the trigger group in the lower receiver. A full-auto compatible bolt carrier group is required for Forced Reset mode and is not included.

Buffer System

The mil-spec heavy-duty 6-position aluminum carbine buffer tube provides the core rear support hardware for the lower receiver. The Sound Mitigation H3 buffer at 5.6 oz covers the buffer system component for the lower completion build. A stock or brace is not included and must be sourced separately.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.