Atrius Development 3-Position Forced Reset Selector - Fits AR-15

Manufactured from heat-treated 4140 steel with a corrosion-resistant coating, the selector delivers robust wear resistance and reliable mechanical engagement with positive, tactile clicks for each position. Its design offers ultra-smooth operation and positional retention to minimize slippage during use while maintaining mil-spec ergonomics for intuitive thumb access and rapid manipulation.

The unit is engineered as a drop-in style selector for many mil-spec AR-15 lowers and is compatible with mil-spec fire control groups that do not have a rear relief cut in the lower. For reliable operation the lower must provide the appropriate FA pocket or low shelf and the build should use an FA bolt carrier group; H2 or H3 buffer weights are recommended for optimal function.

Atrius Forced Reset Selector Specifications
Manufacturer: Atrius Development Group
Model: Atrius Forced Reset Selector
Product Type: Forced Reset Selector
Compatibility: mil-spec AR-15 fire control groups for .223 / 5.56 / .300 BLK
Material: Heat-treated 4140 steel
Finish: Corrosion-resistant coating
Selector Positions: SAFE, SEMI (Traditional), FULL-SEMI
Installation: Drop-in for compatible mil-spec lowers (some lowers may require fitting)
Required/Recommended for Reliable Function: mil-spec trigger without rear relief cut, FA pocket or low shelf in lower, FA bolt carrier group; H2 or H3 buffer recommended
Selector Screw: T10, 4/40 thread (recommended torque and threadlocker per manufacturer guidance)
Special Notes: May require gunsmithing on some platforms and is not compatible with AR-10 platforms without significant modification