AR9 80% Lower Fire/Safe Marked – 9mm – Billet

Buy Polymer80 AR9 80% Billet Lower Fire/Safe Marked – 9mm: The Ultimate Glock-Mag PCC Foundation in 2025

The Polymer80 AR9 80% billet lower fire/safe marked 9mm is the gold-standard starting point for anyone building a pistol-caliber carbine that runs like a sewing machine on Glock magazines. Machined from a solid block of 7075-T6 aerospace aluminum, this dedicated 9mm billet receiver features last-round bolt hold-open geometry, a massively flared and broached magwell, integrated oversized trigger guard, and deep laser-engraved “FIRE / SAFE” markings — all while remaining 100% ATF-compliant as a non-firearm until you finish it.

Unlike converted AR-15 lowers or cheap castings, this AR9 80% billet lower is purpose-built for 9×19mm: reinforced ejector area, correct feed ramp angle, and beefed-up magwell walls that accept Glock 17/19/26 magazines (OEM, Magpul, ETS, KCI) with zero adapters. In stock now at Polymer80 USA with raw or black anodized options — same-day discreet shipping, jig bundles available.

What Makes This the #1 AR9 80% Lower in 2025

• Dedicated 9mm billet design – no Colt vs. Glock mag confusion 7075-T6 billet – 40% stronger than 6061 or forged AR-15 lowers Glock magazine compatible with LRBHO on most mil-spec 9mm BCGs Deep laser-engraved FIRE/SAFE markings that survive Cerakote Threaded bolt catch pin & takedown pin holes – no roll pins ever Massively flared magwell – fastest reloads in PCC competition Integrated oversized trigger guard – winter glove & chassis ready

Full 2025 Technical Specifications

Why Builders Choose the Polymer80 AR9 Billet Lower in 2025

• Runs 100% with Glock factory & aftermarket mags – no Colt mag drama
• Accepts standard AR-15 trigger, grip, and safety
• Works flawlessly with CMMG Radial Delayed, Faxon Bantam, or standard blowback BCGs
• Reinforced magwell walls prevent cracking common in converted AR-15 lowers
• Deep engravings survive thick Cerakote without ghosting

How to Finish It – Average Completion Time 55–80 Minutes

Use any modern multi-platform jig (Easy Jig Gen 3 recommended):

1. Secure lower in jig (dedicated 9mm plates included with most jigs)
2. Drill trigger, hammer, and selector holes
3. Mill fire control pocket and side walls
4. Install 9mm ejector (included or from BCG kit)
5. Send to Cerakote or run raw

Packaging, Storage & Discreet Shipping

• Ships in anti-static foam with protective film over engravings
• All edges wrapped to prevent transit damage
• Plain box, no markings, adult signature required
• Same-day shipping before 3 PM EST · Free shipping over $199

Safety & Legal Compliance

• 100% legal non-firearm until you complete milling (ATF 2025 compliant)
• 18+ with valid ID · Direct ship in legal states
• Auto-blocked in restricted states (CA, NY, NJ, CT, etc.)

Real 2025 Customer Reviews

“Flared magwell + billet strength = the smoothest-running 9mm PCC I’ve ever shot. 1,500 rounds of 147gr subs — zero malfunctions.” – PCC Competitor, Nevada “Cerakoted it in Battleworn Flag — FIRE/SAFE markings still perfect. Best AR9 lower on the market.” – Custom Builder, Texas “Easy Jig Gen 3 finished it in 62 minutes. Glock mags drop free like butter.” – Range Owner, Florida

Frequently Asked Questions – AR9 Billet 80% Lower

Q: Does it work with Colt-style mags? A: No — this is dedicated Glock-mag only (the superior choice for reliability).

Q: Will it accept a standard AR-15 hammer/trigger? A: Yes — uses normal mil-spec FCG.

Q: Is the ejector removable? A: Yes — press-fit, replaceable with standard 9mm ejectors.

Q: Can I run it suppressed? A: Absolutely — pair with a 5–7 oz buffer and adjustable gas block.

**Grab Yours Before They’re Gone These AR9 billet lowers sell out faster than any other 80% product in 2025.

Add the legendary Polymer80 AR9 80% billet lower fire/safe marked to your cart now — and build the smoothest, most reliable 9mm carbine on the planet.