AR-15 Trigger & Selector Bundle – Dirty Bird 3.5lb Drop-In (Flat) + Atrius Super Selector

AR-15 Trigger & Selector Bundle – Dirty Bird 3.5lb Drop-In (Flat) + Atrius Super Selector

This bundle pairs two high-impact upgrades for AR-15 builders who want cleaner trigger control and faster, more confident manipulation at the receiver. The Dirty Bird Single Stage Quick Reset Drop-In Trigger (Flat) delivers a crisp 3.5 lb pull with minimal take-up and a strong, tactile reset, all in a self-contained cassette that installs easily and includes anti-walk pins. Paired with it is the Atrius Development 3 Position Super Selector Safety, a robust SAFE / SEMI / SUPER-SEMI selector with positive detents and a crisp 90° throw, built from heat-treated steel for hard-use durability.

This kit is a great fit for serious range rifles and duty-minded builds where consistent trigger feel and positive selector engagement matter most.

Features

• Dirty Bird 3.5 lb single-stage drop-in trigger with fast, tactile reset
• Curved trigger blade and cassette design for easy installation
• S7 tool steel internals with black nitride finish (trigger components)
• Hard-coat anodized 6061 housing, and includes anti-walk pins
• Atrius 3-position selector: SAFE / SEMI / SUPER-SEMI with positive detents
• Heat-treated 4140 steel selector with corrosion-resistant finish
• Compatible with mil-spec AR-15 lowers / FCGs in .223/5.56/.300 BLK (per manufacturer)

Specifications

Trigger (Dirty Bird)

• Type: Single-stage drop-in, flat
• Pull Weight: 3.5 lb
• Housing: 6061 aluminum, hardcoat anodized
• Internals: S7 tool steel, black nitride finished
• Includes: Anti-walk pins

Selector (Atrius)

• Positions: SAFE / SEMI / SUPER-SEMI
• Throw Angle: 90°
• Material: Heat-treated 4140 steel
• Finish: Corrosion-resistant finish
• Fitment: Drop-in; minor fitment may be required depending on receiver tolerances

Compliance Note: Firearm laws and definitions vary by location and can change. Always verify compliance with federal, state, and local regulations before installation or use.