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

DTT AR-15 Rifle Lower Build Kit - Rare Breed FRT-15L3 Flat 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 Flat Forced Reset Trigger, KAK Industry Lite lower parts kit with mil-spec A2 grip, US Tactical phosphate-finished receiver end plate, AR-15 carbine castle nut, 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 Flat Forced Reset Trigger
• Flat trigger profile
• 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 trigger pins included
• Full-auto compatible BCG required, not included
• KAK Industry Lite lower parts kit with mil-spec A2 grip in black
• US Tactical phosphate-finished mil-spec receiver end plate
• AR-15 carbine castle nut
• Mil-spec heavy-duty 6-position carbine buffer tube
• Sound Mitigation H3 buffer at 5.6 oz

Perfect For

• AR-15 rifle builders sourcing a complete lower build kit with a flat forced reset trigger and buffer tube
• Builders completing a standard mil-spec AR-15 lower receiver with a lower parts kit included
• Competitive shooters adding the Rare Breed FRT-15L3 Flat to an AR-15 rifle build
• Builders sourcing their own stock to pair with this buffer tube and lower completion kit

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 Flat Forced Reset Trigger

The Rare Breed FRT-15L3 Flat is a drop-in forced reset trigger with a flat trigger profile, 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 trigger pins are included to 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.

Lower Parts Kit and Buffer System

The KAK Industry Lite lower parts kit includes all internal lower receiver components and a mil-spec A2 grip in black. The US Tactical phosphate-finished mil-spec receiver end plate and AR-15 carbine castle nut cover the rear hardware for the lower receiver. The mil-spec heavy-duty 6-position carbine buffer tube and Sound Mitigation H3 buffer at 5.6 oz complete the buffer system component for the lower completion build. A stock is not included and must be sourced separately.

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