308 80% Lower – Billet

308 80% Lower – Billet

Buy Polymer80 .308 80% Lower Billet Receiver – The Ultimate DPMS-Compatible Foundation for Custom AR-10 Builds in 2025

In the ever-evolving world of DIY firearm assembly, where precision meets personalization, the Polymer80 .308 80% lower billet receiver stands as a beacon for builders seeking uncompromised strength and versatility. As of November 2025, this isn’t just another unfinished lower—it’s a meticulously engineered masterpiece machined from 7075-T6 aerospace-grade billet aluminum, delivering the robustness needed for .308 Winchester’s thunderous recoil while adhering to strict ATF guidelines as a non-serialized, non-firearm component. At Polymer80 USA, we’ve poured years of innovation into this AR-10 .308 80% lower billet to ensure it empowers you to craft everything from sub-MOA long-range precision rifles to rugged suppressor-ready tactical platforms—all without an FFL transfer or invasive paperwork.

Weighing a balanced 12.5 oz unfinished, this DPMS Gen 1 .308 80% lower features a fully broached and flared magwell that accepts Magpul PMAG LR/SR GEN M3, Lancer L5 AWM, and SureFire 60-rounders with seamless reliability. The integrated oversized trigger guard spans 2.5 inches for glove-friendly operation, while the reinforced buffer tower—beefed up with extra material in high-stress zones—handles A5 systems and 5.5 oz tungsten buffers like a champ, taming the .308’s 20,000+ psi chamber pressures. Compatible with 90% of AR-10 uppers (Aero Precision M5, PSA PA-10, CMMG Resolute), it supports caliber swaps to 7.62×51 NATO, 6.5 Creedmoor, or even .243 Win, making it the go-to for hunters, PRS competitors, and home defenders alike. Order your Polymer80 .308 80% billet lower for sale today—same-day shipping from our U.S. warehouse, with bundle options including jigs and LPKs for under $250.

What Is the Polymer80 .308 80% Lower Billet Receiver? A Builder’s Blank Canvas for AR-10 Excellence | 308 80% Lower – Billet

At its heart, the Polymer80 .308 80% lower billet receiver is an unfinished firearm component—legally classified as 80% complete per ATF standards—designed specifically for the DPMS Gen 1 AR-10 platform. Machined from a single block of 7075-T6 aluminum via advanced 5-axis CNC processes, it arrives with the fire control group (FCG) pocket partially drilled (to 0.345″ depth) and side plates unmilled, requiring only your finishing to transform it into a serialized, functional lower. This billet construction—unlike forged or polymer alternatives—offers superior grain flow for even stress distribution, making it ideal for high-pressure .308 loads that generate up to 2,500 ft-lbs of muzzle energy.

Introduced in Polymer80’s 2023 lineup and refined through 2025 with enhanced tolerances based on user feedback from Sniper’s Hide forums, this lower weighs 12.5 oz unfinished, measuring 7.75″ long, 1.60″ wide, and 4.5″ tall (including the trigger guard). It’s not just a blank; it’s a precision foundation with pre-contoured rear lugs for zero headspace issues and a bullnose profile to prevent snags during assembly. For builders, it’s the starting point for custom rifles that blend mil-spec reliability with personal flair—whether you’re threading a Faxon 16″ barrel for suppressor use or mounting a Nightforce ATACR optic for 1,000-yard PRS stages. In essence, it’s your ticket to owning a rifle that’s 100% yours, from the ground up.

Key Features and Technical Specifications of the Polymer80 .308 80% Lower Billet Receiver

What makes the Polymer80 AR-10 .308 80% lower a standout in 2025? It’s the thoughtful integration of features honed from real-world testing, ensuring it outperforms basic forgings in endurance and ergonomics. Key highlights include:

• 7075-T6 Billet Aluminum Construction: Aerospace-grade alloy with 83,000 psi yield strength—40% stronger than 6061-T6—resisting cracks under 5,000+ rounds of .308 FMJ, per Pew Pew Tactical’s 2025 stress tests.
• Flared Broached Magwell: 1.5″ entry for rapid PMAG insertions; compatible with DPMS/SR-25 patterns, reducing feed failures by 25% in dynamic drills.
• Integrated Oversized Trigger Guard: 2.5″ span with rounded edges for winter ops or chassis integration—no aftermarket add-ons needed.
• Threaded Bolt Catch and Takedown Pins: 5/16-18 threads eliminate roll pins, simplifying assembly and preventing stripped holes.
• Reinforced Buffer Tower: Extra webbing dissipates heat 30% faster, supporting A5 tubes and H2 buffers for suppressed .308 builds.
• Upper Tension Set Screw Provision: 4-40 hole for zero wobble—critical for sub-MOA accuracy at 600+ yards.
• Ambi Safety Detents and Engraving-Ready Markings: Pre-milled for left-handed selectors; “SAFE/FIRE” cutouts for easy compliance engraving.

For precise builders, here’s the full spec sheet, validated against 2025 mil-spec tolerances from Precision Rifle Blog:

These specs ensure compatibility with 95% of AR-10 parts, from Toolcraft BCGs to Geissele triggers, making it a versatile base for any build.

Why Choose the Polymer80 .308 80% Lower Billet Receiver? Superior Strength, Privacy, and Value in 2025 | 308 80% Lower – Billet

In a market flooded with $60 polymer blanks that warp under .308 torque or $200+ forged lowers with inconsistent tolerances, the Polymer80 .308 80% billet lower strikes the perfect balance: Billet durability at forged prices ($129.99), with privacy baked in—no serialization until you mill it yourself, sidestepping ATF’s 2025 ghost gun registries. Why billet? 2025 tests from Military Arms Channel reveal it endures 45% more recoil cycles than 6061 forgings before deformation, slashing failure risks in high-volume training (1,000+ rounds/week). The flared magwell and tension screw deliver “factory-tight” fitment, boosting accuracy by 0.5 MOA at 300 yards when paired with Criterion barrels.

For hunters, its lightweight profile (under 8 lbs complete) means easier treks; PRS shooters love the reinforced tower for consistent gas system performance. Resale? Completed builds fetch 20–30% premiums on GunBroker, thanks to the premium 7075 material. As one 2025 Sniper’s Hide reviewer put it: “Polymer80’s billet .308 lower is the sweet spot—tough as LMT, affordable as PSA.” Choose it for builds that last generations, not just a season.

How to Use the Polymer80 .308 80% Lower Billet Receiver: Step-by-Step Finishing and Assembly Guide | 308 80% Lower – Billet

Transforming your Polymer80 AR-10 .308 80% lower into a ready-to-shoot component is straightforward, thanks to its user-friendly design. Based on 2025 guidelines from 80% Arms and Daytona Tactical, expect 60–90 minutes with basic tools. Start with an Easy Jig Gen 3 ($199 bundle available) or Modulus Arms router jig—no mill required.

Usage Instructions for Finishing: | 308 80% Lower – Billet

1. Preparation (10 mins): Secure the jig to a stable bench; insert the lower upside-down, torquing cap screws to 10 ft-lbs. Wear safety glasses and use cutting oil on 7075-T6 to prevent binding.
2. Drilling (15 mins): Pilot the FCG holes (0.154″ depth) with 5/16″ and 3/8″ bits for trigger/hammer pins; add 1/8″ for the selector. Slow RPM (1,000–1,500) to avoid walk.
3. Milling (30–45 mins): Side pockets first (0.275″ depth, 0.010″ passes per rev with 3/8″ end mill), then the fire control pocket to 1.65″ top depth. Deburr with 600-grit for smooth LPK fit.
4. Inspection and Finishing (10 mins): Dry-fit pins; bead-blast if raw. Cerakote milled areas for protection (C-series for heat zones).

Assembly and Operation: | 308 80% Lower – Billet

• Install mil-spec LPK (e.g., Aero AR-10 kit, $50); torque pivot pins to 40 in-lbs.
• Thread buffer tube (1-3/8″ x 16 TPI); add 15–20 lb Sprinco spring for .308.
• Mate with DPMS upper; torque barrel nut 35–80 ft-lbs. Function-check dry 50x.
• For use: Load SAAMI-spec .308; zero at 100 yards. Clean after 200 rounds—bore snake chamber, lube rails lightly.

Pro tip: Pair with a 1:10 twist barrel for 168–175gr match ammo, achieving 1 MOA at 600 yards.

Safety Guidelines for the Polymer80 .308 80% Lower Billet Receiver | 308 80% Lower – Billet

Safety is non-negotiable with .308’s power: Always verify unloaded (triple chamber check), maintain muzzle discipline, and use backstops for 1,000+ yard potential. During milling, secure tools to prevent kickback; wear gloves to avoid aluminum shards. Post-build, inspect for cracks quarterly—our billet’s strength minimizes this, but torque all fasteners (38 ft-lbs castle nut). Ammo: Stick to .308 Win/7.62 NATO; avoid +P without inspection. Storage: Keep unfinished in a cool, dry safe (<50% RH) to prevent oxidation; completed rifles locked away from unauthorized access. Per 2025 ATF rules, personal builds require no reporting, but range quals ensure proficiency.

Packaging, Storage, and Shipping: Polymer80 USA’s Commitment to Secure Delivery | 308 80% Lower – Billet

Your Polymer80 .308 80% lower billet arrives in ESD-safe, foam-padded packaging with a desiccant pouch to shield against humidity—complete with assembly diagram and compliance card. Raw finishes ship wrapped in protective film; anodized in sleeves. For storage, horizontal racking in a 50–70°F safe preserves tolerances; vertical ok for space but avoid long-term pressure on rails.

Shipping: Discreet UPS Ground/USPS Priority, same-day pre-3 PM EST, insured to $500. Free over $199; no FFL as non-firearm. Auto-blocks restricted states (CA, NY, NJ); international via ITAR ($75 fee). Unmarked boxes ensure privacy—tracking via secure portal.

Our Services at Polymer80 USA: From Build Support to Lifetime Assurance | 308 80% Lower – Billet

We’re your partners in every step:

• 24/7 Support: Live chat, email (support@polymer80usa.com), or hotline—jig troubleshooting in <1 hour.
• Product Replacement: 60-day DOA swaps; 1-year milling defect coverage.
• Authenticity Guarantee: Batch-laser etched; fakes? Full refund + $50 credit.
• Technical Consultation: Free 20-min video calls with certified gunsmiths for pattern advice.
• Complaint Handling: Escalated in 24 hours; 99% resolution rate per 2025 feedback.

Legal Considerations, Payment Options, and How to Buy Your Polymer80 .308 80% Lower Billet | 308 80% Lower – Billet

Federally legal as 80% unfinished (GCA 1968/ATF 2025), 18+ only—no serialization for personal use. State restrictions: Banned in CA/NY as precursors; we screen zips. Prohibited persons barred; consult locals for post-completion engraving.

Payments: Secure Visa/MC/AmEx, PayPal, ACH (2% off); crypto (BTC/ETH) for anonymity. No fees; bundles save 15%.

How to Buy: 1. Select finish/jig bundle. 2. Add to cart (code BUILD25 for 10% off). 3. Checkout securely—ships next day. Low stock? Waitlist alerts.

Real Testimonials and Customer Reviews: Voices from 2025 Polymer80 .308 Builds

From verified 2025 sources:

“Polymer80’s billet .308 lower turned my PRS rig into a 1,000-yard monster—zero flex after 800 suppressed rounds. Flared magwell is elite.” – Jake R., CO (5/5, Sniper’s Hide)

“Easy Jig finish in 75 mins; Aero M5 lockup tighter than factory. Best value .308 80% billet lower—feeds 6.5 CM flawlessly.” – Hunter T., MT (Pew Pew Tactical)

“Threaded pins saved headaches; sub-MOA with Faxon barrel. Polymer80’s reinforcements held up to 1,200 FMJ—unbreakable.” – Tactical Builder, TX (AR15.com)

4.96/5 from 2,100+ reviews: “Tougher than mil-spec, lighter than expected.”

Frequently Asked Questions (FAQs): Polymer80 .308 80% Lower Billet Essentials

Q: Compatible with SR-25 uppers? A: DPMS Gen 1 only—adapters available; contact support.

Q: Best jig for beginners? A: Easy Jig Gen 3—bundles include bits/end mill.

Q: Ships to CA/NY? A: No—auto-restricted; polymer alternatives compliant.

Q: Handles suppressors? A: Yes—tower supports H2 buffers for Dead Air cans.

Q: Raw vs. anodized? A: Raw for Cerakote; anodized for instant corrosion resistance.

Q: Weight savings vs. forged? A: 10–15% lighter at equal strength—perfect for hunters.

More? 24/7 chat ready.

Limited Stock Alert – Secure Your Polymer80 .308 80% Billet Lower Today

Billet batches vanish fast in 2025’s build surge. If “In Stock” shows, grab it—join our waitlist for alerts.

Elevate your AR-10 with the unbeatable Polymer80 .308 80% lower billet receiver—add to cart now and forge your legacy.