DTT FDE AR-15 Rifle Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, M4 Style FDE Adjustable Carbine Stock

DTT FDE AR-15 Rifle Lower Build Kit, Rare Breed FRT-15L3 Flat Trigger, Davidson Defense M4 Style FDE Adjustable Carbine Stock

This is a Delta Team Tactical AR-15 rifle 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 complete Mil-Spec AR-15 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 6-position 6061-T6 aluminum carbine buffer tube 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 Davidson Defense AR-15 and M16 Mil-Spec 6-position adjustable carbine stock in FDE reinforced polymer with a textured non-slip buttplate and integrated sling loop closes out the rear end, tying the FDE finish of the lower receiver and stock 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
• Mil-Spec heavy-duty 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
• Davidson Defense AR-15 and M16 Mil-Spec 6-position adjustable carbine stock, FDE, reinforced polymer, spring-loaded adjustment lever, textured non-slip buttplate, integrated sling loop

Perfect For

• AR-15 rifle builders who want a complete lower build kit centered on the Rare Breed FRT-15L3 forced reset trigger with a color-matched FDE Davidson Defense stock
• 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 Davidson Defense stock 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 reinforced polymer of the Davidson Defense stock at the rear end, giving this kit a color-matched lower build foundation from receiver to stock. 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 6-position carbine buffer tube in 6061-T6 aluminum provides a solid and Mil-Spec compatible 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 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 Davidson Defense AR-15 and M16 Mil-Spec 6-position adjustable carbine stock in FDE reinforced polymer fits directly onto the Mil-Spec carbine buffer tube and closes out the rear end with a 6-position adjustable length of pull locked by a spring-loaded adjustment lever, a textured non-slip buttplate, and an integrated sling loop. The FDE color of the Davidson Defense stock 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.