DTT FDE AR-15 Pistol Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, Gauntlet Arms Polymer Stabilizing FDE Brace

DTT FDE AR-15 Pistol Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, Gauntlet Arms FDE Polymer Stabilizing Brace

This is a Delta Team Tactical AR-15 pistol lower build kit built around a 7075-T6 aluminum lower receiver in FDE Cerakote with a Mil-Spec AR-15 pattern, a low shelf trigger pocket with M16 cut, and ambidextrous engraved pictogram selector markings covering Safe, Semi, and Full Auto positions on both sides of the receiver. The defining component of this kit is the Rare Breed FRT-15L3 flat forced reset trigger, a drop-in unit built from 7075 anodized aluminum and heat-treated 4140 steel with a flat ambidextrous trigger profile, three-position operation covering Safe, Semi, and Forced Reset modes, and included anti-walk trigger pins. The FRT-15L3 requires a full-auto compatible bolt carrier group, which is not included in this kit and must be sourced separately. The lower parts kit, 3-position ambidextrous safety selector, and Mil-Spec A2 grip in black cover the remaining internal lower components and grip interface. The buffer system runs on a heavy-duty pistol buffer tube for AR-15 and AR style pistols in 6061-T6 aluminum in black, paired with a Sound Mitigation H3 buffer at 5.6 oz., a Mil-Spec metal receiver end plate, and a steel notched castle nut in phosphate finish. A Gauntlet Arms FDE high-strength polymer stabilizing brace with an integrated sling loop closes out the rear end, tying the FDE finish of the lower receiver and brace together into a cohesive color-matched build foundation.

Key Features

• 7075-T6 aluminum lower receiver, FDE Cerakote, Mil-Spec AR-15 pattern
• Low shelf trigger pocket with M16 cut
• Ambidextrous engraved pictogram selector markings, Safe, Semi, Full Auto, both sides
• Standard AR-15 and STANAG magazine compatible
• Complete Mil-Spec AR-15 lower parts kit with Mil-Spec A2 grip, black
• Rare Breed FRT-15L3 flat forced reset trigger, drop-in, 7075 anodized aluminum and heat-treated 4140 steel, flat ambidextrous profile, Safe, Semi, Forced Reset modes, anti-walk pins included
• 3-position ambidextrous safety selector
• Heavy-duty pistol buffer tube for AR-15 and AR style pistols, 6061-T6 aluminum, black
• Sound Mitigation H3 buffer, 5.6 oz.
• Mil-Spec metal receiver end plate
• Steel notched castle nut, phosphate finish
• Gauntlet Arms polymer stabilizing brace, FDE, high-strength polymer, fixed, integrated sling loop

Perfect For

• AR-15 pistol builders who want a complete lower build kit centered on the Rare Breed FRT-15L3 forced reset trigger with a color-matched FDE Gauntlet Arms brace
• Shooters pairing this kit with an existing upper assembly and a full-auto compatible bolt carrier group
• Builders who want a FDE Cerakote lower receiver and matching FDE Gauntlet Arms brace as a cohesive color-matched foundation with the FRT-15L3 and Sound Mitigation H3 buffer already included

Lower Receiver

The 7075-T6 aluminum lower receiver is finished in FDE Cerakote with a Mil-Spec AR-15 pattern, a low shelf trigger pocket with M16 cut, and ambidextrous engraved pictogram markings for Safe, Semi, and Full Auto selector positions cut into both sides of the receiver. The FDE Cerakote finish ties directly into the FDE high-strength polymer of the Gauntlet Arms brace at the rear end, giving this kit a color-matched lower build foundation from receiver to brace. The low shelf and M16 cut make it compatible with the FRT-15L3 drop-in trigger housing.

Rare Breed FRT-15L3 Flat 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 with a flat ambidextrous trigger face and three-position operation covering Safe, Semi, and Forced Reset modes. The forced reset mode is the defining feature of the FRT-15L3, where the bolt carrier group forces the trigger to reset on the rearward stroke, allowing for a faster follow-up trigger pull than a standard semi-automatic trigger while still requiring a separate trigger pull for each round fired. Anti-walk trigger pins are included and keep the drop-in housing secured in the lower receiver trigger pocket. The FRT-15L3 requires a full-auto compatible bolt carrier group for proper operation. A full-auto compatible BCG is not included in this kit and must be sourced by the buyer before the trigger will function as designed.

Buffer System and Rear Hardware

The heavy-duty pistol buffer tube for AR-15 and AR style pistols in 6061-T6 aluminum provides a pistol-platform appropriate buffer tube foundation. The Sound Mitigation H3 buffer at 5.6 oz. is a heavier buffer choice that works within the buffer tube to manage the cyclic rate on the AR-15 pistol platform, a relevant pairing with a trigger system like the FRT-15L3. The Mil-Spec metal receiver end plate and steel notched castle nut in phosphate finish lock the buffer tube down at the rear of the lower receiver. The Gauntlet Arms FDE high-strength polymer stabilizing brace fits over the pistol buffer tube and closes out the rear end with a fixed profile and an integrated sling loop for sling attachment without additional hardware. The FDE color of the brace ties back to the FDE Cerakote on the lower receiver, giving the full lower build a color-matched foundation that carries from the receiver through to the rear end.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. The Rare Breed FRT-15L3 requires a full-auto compatible bolt carrier group for proper operation. A full-auto compatible BCG is not included in this kit and must be sourced separately.