Atrius Development Group ADG-FRS-S-MS Forced Reset Selector AR-15 3-Position SAFE/SEMI/SUPER

The Atrius Development Group ADG-FRS-S-MS Forced Reset Selector brings a 3-position configuration to the standard Mil-Spec AR-15 platform, giving the operator instant access to Safe, Semi, and Super-Semi firing modes. The "MS" Mil-Spec variant is purpose-built for retro and clone builders who want a period-correct selector profile without the more aggressive modernized lever shape.

This single-side selector is compatible with mil-spec / full-profile AR-15 fire control groups chambered in .223 Remington, 5.56 NATO, and .300 Blackout, and installs as a drop-in replacement with no permanent modifications required. The selector uses a T10 screw with a 4-40 thread and ships with a matching selector spring; Atrius recommends torquing the screw to 15 in/lbs with blue Loctite for a secure install.

Built around a solid lever cam design, the ADG-FRS-S-MS is machined from 4140 steel and finished in black for durability and a clean, factory-style appearance. Whether you are running a clone-correct build or simply prefer the traditional Mil-Spec lever look, this selector delivers the Atrius forced-reset performance in the classic package.