Dirty Bird Falcon AR-15 Complete Lower Receiver w/ Atrius Super Selector - D258

Dirty Bird NOLO Complete Lower + Atrius 3-Position Super Selector

We did the tricky part. You just add an upper and go shooting.

Here’s what makes the Atrius Super Selector so cool: it isn’t a trigger, and it isn’t some complicated swap. It’s a safety selector with a third position. Flip past SAFE and SEMI to SUPER-SEMI and your regular trigger resets fast — giving you quick, controlled follow-up shots that feel like nothing else on a standard AR. Want to settle back down for precise single shots? Just throw it back to SEMI. Same rifle, two totally different personalities — all from one flip of your thumb.

The only tricky part with these selectors is the install. Receiver tolerances vary, the fitment can be fussy, and rushing it can damage the part. So we take care of all of that for you. Our gunsmiths drop the Atrius into our NOLO Complete Lower, fit it, and function-check the whole assembly before it leaves the shop. You get a clean, no-logo lower that’s ready to run — no guesswork, no special tools, no late-night YouTube rabbit holes.

We didn’t stop at the install, either — we built the whole lower around the super selector so it runs right from the first magazine. Two upgrades make the difference:

• An H3 heavy buffer instead of a standard carbine buffer. The extra weight keeps the action cycling smooth and consistent, which is exactly what a forced-reset selector wants to run reliably.
• Our Dirty Bird Single-Stage Nickel Teflon trigger in place of a gritty mil-spec trigger. Honed and polished engagement surfaces and a slick Nickel Teflon finish give you a smooth pull with a clean, crisp break — and it’s just the kind of trigger the Atrius is designed to work with. It even ships with a reduced-power spring set if you like a lighter pull.

Three flips of the thumb:

• SAFE — locked up and ready to carry
• SEMI — your normal, accurate single shots
• SUPER-SEMI — forced-reset fire for fast, fun, controlled follow-ups

What you’re getting:

• Our NOLO forged complete lower — 7075-T6 aluminum, tough hard-coat anodized finish, no logos or roll marks, marked “MULTI”
• The Atrius 3-Position Super Selector — heat-treated 4140 steel, crisp 90° throw, made in the USA — installed and dialed in
• Our Dirty Bird Single-Stage Nickel Teflon trigger — smooth, clean break with a reduced-power spring set in the box, and backed by the Dirty Bird Limited Lifetime Warranty
• An H3 heavy buffer — spec’d specifically to keep the super selector cycling reliably
• A2 grip, M4 carbine stock, buffer spring, castle nut & end plate
• Assembled, fitted, and function-checked in Youngsville, NC

A few quick things to know:

• Ships to your FFL — a complete lower counts as the firearm
• Built around standard mil-spec triggers in .223 / 5.56 / .300 BLK
• Can’t ship to: CA, CT, DE, FL, HI, IL, MA, MD, MN, NJ, NY, OR, RI, WA, D.C., U.S. territories, or overseas

No logo, no nonsense, and no fighting with fitment — just flip to that third position and have some fun.

By purchasing this product, you acknowledge that you are legally permitted to own and possess it in your jurisdiction. It is your responsibility to ensure compliance with all federal, state, and local laws. The Atrius FRS is designed as a safety selector and must be used in accordance with all applicable firearms regulations. We are not responsible for misuse or violations of law.