Atrius Forced Reset Saftey Selector - Milspec 1 sided lever

Atrius Mil-Spec Forced Reset Selector Single Side

(Safe / Semi / Super-Semi)

The Atrius Mil-Spec Forced Reset Selector is a drop-in, three-position selector for the AR-15. It adds a forced trigger reset to the fire-control group you already have.

It looks like a standard issue selector and runs with a mil-spec trigger that has no rear U-notch relief cut. The third position, Super-Semi, comes without swapping in a cassette trigger. If you're building a retro carbine and want the controls to look like they came off the rack decades ago, this is the version Atrius made for you.

Key Features

• Three positions: Safe, Semi, and Super-Semi, with positive 90° indexing and a crisp detent.
• Traditional mil-spec lever: Single-side, period-correct profile with ergonomic ridges and a pointer that shows your position at a glance.
• Drop-in: No receiver or trigger modifications on a compatible lower.
• Works with your trigger: Built around standard mil-spec triggers without the U-notch, plus a range of single-stage drop-in triggers.
• Refined reset lever: Lighter, more focused, and spring-loaded in its seat, working with a solid lever cam.
• Built to last: Heat-treated 4140 steel with a corrosion-resistant black nitride finish. Made in USA.

It Looks Like a Mil-Spec Selector. It Doesn't Feel Like One.

From the outside, your clone keeps a plain, issue-style selector. Nobody at the range will notice anything different until you rotate past Semi.

In Semi, the rifle runs exactly as it always has. In Super-Semi, the rearward-moving bolt carrier presses the selector's reset lever down against the rear of the trigger, pushing the trigger forward to reset it. Each shot still requires a separate function of the trigger. And it isn't a binary trigger: no shot is fired on trigger release.

The result is fast, rhythmic shooting from a rifle that still looks period-correct on the bench. On a retro carbine, it's about as much fun as a trip to the range gets.

Atrius Mil-Spec FRS or the ARC-Fire?

Both put a forced reset in the selector, but they get there differently. The Atrius keeps your existing trigger, as long as it has no U-notch, and keeps a single-side, traditional look. Its lighter, spring-loaded reset lever is a small detail that helps it run smoothly. The ARC-Fire V2 kit ships with ambidextrous levers and a pre-cut trigger, because most mil-spec triggers need the SS cut to work with it. If you want the most original-looking selector on your clone, the Atrius Mil-Spec FRS is the natural choice.

Is Your Rifle Ready? Check These Four Things

A forced reset selector relies on the bolt carrier to do the resetting, so the rest of the rifle matters. Atrius lists these minimum requirements:

• Lower receiver: Low-shelf or full-profile trigger pocket.
• Bolt carrier group: Full-profile (M16-pattern) BCG. Semi-cut or lightweight carriers won't reset it.
• Buffer: H2 or H3. Rifle-length (A1/A2) buffer systems are not on Atrius's list.
• Trigger: A mil-spec trigger without the U-notch relief cut, or another trigger on the Atrius compatibility list.

Calibers: .223 Rem / 5.56 NATO and .300 BLK. Not for AR-10 / SR-25 platforms. Atrius's own customer reviews include a suppressed .300 BLK carbine running reliably.

Running a Geissele trigger? This standard lever isn't designed for Geissele 2-stage triggers; Atrius makes a separate G-Lever model. If your rifle or trigger has been modified to Super Safety specifications, check compatibility first. The Atrius uses a solid lever cam rather than the Super Safety's dovetailed cam, which Atrius notes allows about 15° of play.

From Our Bench: Plan on a Little Tuning

Technical Specifications

Installation note: If you've never installed a selector, have a qualified gunsmith do it. Improper installation can cause a malfunction.

Restricted States: Forced reset devices are restricted in some states. We cannot ship this item to CA, CO, CT, DC, DE, FL, HI, IL, MA, MD, MN, NJ, NV, NY, OR, RI, or any U.S. territory, including PR. We do not export. You are responsible for knowing and following your federal, state, and local laws. Please confirm your location is eligible before adding to cart.