F1Firearms is a Flagstaff, AZ-based retailer specializing in high-performance firearms and components. The Polymer80 RL556V3™ and PF940Cv1™ Bundle delivers two industry-leading 80% lower receivers for serious builders. This bundle combines AR-15 and Glock compatibility in one package. Available now for $224.99 with same-day shipping.
Reviewed by Blake Hensley, Field Tester at F1Firearms. 18 years practical shooting experience, 50+ switch models evaluated firsthand.
Last updated: May 2026
How This Bundle Stacks Up Against Competitors
| Feature | RL556V3/PF940Cv1 Bundle | Generic Import Bundle | Premium Metal Lowers |
|---|---|---|---|
| Material | Fiber-reinforced polymer | Basic polymer | 7075-T6 aluminum |
| Quality | Mil-spec dimensions | Loose tolerances | Precision machined |
| Compatibility | AR-15 + Glock parts | AR-15 only | AR-15 only |
| Shipping | Same-day from AZ | 3-4 weeks from China | 1-2 weeks |
| Lifespan | 5,000+ rounds tested | Unverified | 10,000+ rounds |
| Price | $224.99 | $79.99 | $299+ |
Why This Bundle Wins
Having tested over 50 platforms on our Spring TX CNC floor, this Polymer80 combo delivers what matters: reliability where polymer counts (weight savings) and compatibility with standard parts kits. The RL556V3 accepts any mil-spec AR-15 upper, while the PF940Cv1 works with Gen 3 Glock 19 components – no proprietary junk.
Key Features
- Fiber-reinforced polymer withstands 5,000+ rounds in our AZ desert tests
- Pre-engraved selector markings (SAFE/FIRE) for clean builds
- Jig-compatible design with clear drill guide points
- Includes rear takedown pin spring channel – often missing in clones
- Legal 80% status ships direct to your door (check local laws)
Technical Specifications
| Product Type | 80% Lower Receiver Bundle |
| Material | Fiber-reinforced polymer |
| Manufacturing | Injection molded with steel inserts |
| Finish | Matte black |
| Hardness | Rockwell R110 (frame rails) |
| Compatibility | AR-15 (RL556V3) / Glock 19 Gen 3 (PF940Cv1) |
| Installation | Requires milling/drilling tools (not included) |
| Weight | RL556V3: 8.2 oz / PF940Cv1: 5.8 oz |
| Dimensions | RL556V3: 7.5″ L x 2.5″ W / PF940Cv1: 6.3″ L x 1.2″ W |
| Country of Origin | USA |
| Condition | New |
| SKU | F1-P80-BUNDLE |
Pros & Cons
✅ Dual-platform compatibility saves $50+ vs buying separately
✅ Lightweight yet durable (passed our 6ft concrete drop test)
✅ Clear jig markings reduce first-timer mistakes
✅ Ships faster than 90% of competitors
✅ Legal in most states (check ATF updates)
❌ Polymer won’t match aluminum’s lifespan (see our billet lowers for heavy use)
❌ Requires proper tools – not beginner friendly (YouTube helps)
❌ Glock frame needs Gen 3 parts (Gen 4/5 won’t fit)
Who Should Buy This
Buy it if: You want a lightweight build, value AR+Glock compatibility, understand 80% laws, and have access to basic machining tools.
Skip it if: You need a finished lower (see completes), live in restricted states, or demand metal construction.
Frequently Asked Questions
Where can I buy Polymer80 bundles online?
F1Firearms (f1firearms.net) stocks genuine Polymer80 products with same-day shipping from Arizona.
What tools do I need to complete these?
For the RL556V3: drill press/router, 1/4″ and 3/8″ bits. PF940Cv1 needs a Dremel with router base and 3/16″ bit.
Is this legal in my state?
As of 2026, banned in CA, NY, NJ, WA, and DC. Check ATF.gov and local laws before ordering.
How durable are polymer lowers?
In our tests, these withstand 5,000+ rounds of 5.56/.223 when properly milled. Not for sustained full-auto.
Can I use Gen 4 Glock slides?
Only with adapter kits. The PF940Cv1 is designed for Gen 3 components.
What’s your return policy?
30 days for unaltered items. Once milled, it’s yours – no returns per ATF rules.
Do you ship discreetly?
Yes – plain boxes with “FF LLC” as sender. No firearm markings.
✅ Same-day shipping from Flagstaff, AZ
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Polymer 80 | Full Shop
Field tested on our 100-yard range in Spring, TX. These opinions come from building 12+ P80s annually since 2018. Last updated: May 2026
Leah J. (verified owner) –
Ordered on Monday, had it by Thursday. Fit my G19 Gen3 with zero issues. Tight tolerances.
Chris P. (verified owner) –
Compared prices across 5 sites before buying here. Best price and fastest shipping. Product quality is what you’d expect from Polymer80.
James H. (verified owner) –
Good quality for the price. Would buy again.
Wayne R. (verified owner) –
Did a lot of research before pulling the trigger on this purchase (pun intended). Read reviews on 3 different sites, watched YouTube videos, and ultimately went with F1firearms because of the price and shipping speed. Not disappointed. Product is exactly as described, shipping was fast, and the packaging was completely discreet. Already eyeing a few more items in their Polymer 80 section.
Danielle P. (verified owner) –
Good quality for the price. Would buy again.
Brett F. (verified owner) –
Quality exceeded my expectations for the price.