The Atrius Super Selector (also called Atrius Forced Reset Selector) and the M16 Style Selector GEN2 are three-position forced reset safety selectors for mil-spec AR-15 rifles. They offer Safe, Semi, and Super-Semi (assisted reset) modes.

Both are selector-based systems that work with your existing mil-spec or compatible fire control group. Installation and requirements are nearly identical. This guide covers both.

This guide is not legal advice. Always verify federal, state, and local laws before purchasing or using any rate-enhancing device.

• Atrius products: Atrius Selector page
• M16 Style Selector GEN2: M16 Style Selector - GEN2

Atrius Variants

Atrius offers three main styles:

All are CNC-machined from heat-treated 4140 steel with a corrosion-resistant finish. They feature a ~90-degree throw and a solid lever cam design.

The M16 Style Selector GEN2 uses a traditional M16-style selector switch and is CNC-machined from heat-treated 4140 tool steel with a black oxide finish. Users report it works particularly well with mil-spec trigger shoes.

How They Work

1. You pull the trigger → one round fires.
2. The BCG cycles rearward and engages the cam/trip arm.
3. The mechanism mechanically forces the trigger forward into the reset position.
4. You pull the trigger again for the next shot.

The disconnector still functions. The system remains semi-automatic.

Compatibility Requirements

• Full-auto profile (M16) BCG: Required. Browse M16 Bolt Carrier Groups.
• Buffer: Recommended H3 - M16 Full Auto Slide Dead Blow Buffer - GEN2 or KYNSHOT Hydraulic AR15 H3 Buffer.
• Trigger: Most mil-spec triggers work. Minor modification to the trigger tail may be needed on some setups.
• Anti-walk pins: Recommended. See Anti-Walk Pins.
• Low-shelf lower preferred: Myth Industries Billet AR-15 Lower

.300 Blackout Builds

• Buffer: Kynshot AR15 Hydraulic Buffer (RB5000HP)
• BCG: KAK DBC Bolt Carrier Group
• Gas: Adjustable gas block helpful

9MM / AR-9 Builds

See our AR-9 Installation Guide.

• PREMIUM Forced Reset Device™ CUT 9MM Bolt Carrier Group
• Kynshot AR9 Hydraulic Buffer (RB5007)

Note: Some AR-9 variants may require minor gunsmithing for the selector.

Installation Overview (Atrius & M16 Style)

1. Clear the firearm and separate upper/lower.
2. Remove the pistol grip to access the detent and spring.
3. Remove the existing safety selector, detent, and spring.
4. Install the new Atrius or M16 Style Selector.
5. Reinstall the grip and function check carefully.
6. Test with dummy rounds, then live fire.

About 40% of setups may need minor trigger tail modification for full clearance. Most installs take 10–20 minutes.

Common Issues

No reset: Buffer too light. Use the H3 GEN2.

Selector binding: Check detent and lever orientation. High-shelf lowers can interfere.

Light strikes: Bolt bounce - upgrade buffer.

Final Thoughts

Both the Atrius Selector and the M16 Style Selector GEN2 are excellent selector-based options if you want to keep your existing trigger. They share the same core requirements: M16-profile BCG and proper buffer weight. The H3 GEN2 Slide Dead Blow Buffer is the most common recommendation for reliable function.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. Firearm laws change frequently. Verify all applicable federal, state, and local regulations before purchasing or using any Forced Reset Device. Always follow safe firearm handling practices.