DTT FDE AR-15 Pistol Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, SBA3 Stealth Gray Adjustable Stabilizing Brace

DTT FDE AR-15 Pistol Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, SB Tactical SBA3 Stealth Gray Adjustable 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 Mil-Spec heavy-duty AR-15 6-position carbine buffer tube 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. An SB Tactical SBA3 adjustable pistol stabilizing brace in stealth gray high-strength polymer closes out the rear end, creating a deliberate two-tone finish combination between the FDE lower receiver and the stealth gray brace.

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
• Mil-Spec heavy-duty AR-15 6-position carbine buffer tube, 6061-T6 aluminum, black
• Sound Mitigation H3 buffer, 5.6 oz.
• Mil-Spec metal receiver end plate
• Steel notched castle nut, phosphate finish
• SB Tactical SBA3 adjustable pistol stabilizing brace, stealth gray, high-strength polymer, adjustable, Mil-Spec carbine buffer tube compatible

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 stealth gray SB Tactical SBA3 brace against an FDE lower
• 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 paired with a stealth gray SBA3 brace for a deliberate two-tone finish combination 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 creates a deliberate and purposeful color contrast against the stealth gray SBA3 brace at the rear end, giving this lower build a two-tone finish combination that sets it apart from both all-black and all-FDE builds. 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 Mil-Spec heavy-duty AR-15 6-position carbine buffer tube in 6061-T6 aluminum provides a Mil-Spec compatible buffer tube foundation suited to the SBA3 brace. 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 SB Tactical SBA3 adjustable pistol stabilizing brace in stealth gray high-strength polymer fits over the Mil-Spec 6-position carbine buffer tube and closes out the rear end with an adjustable profile and a well-regarded brace design trusted across the AR pistol platform. The stealth gray color of the SBA3 sits in contrast to the FDE Cerakote of the lower receiver, giving the full lower build a two-tone finish that carries a distinct visual profile from receiver to brace.

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.