Polymer80 RL556V3 – RHINO 80% AR15 Lower Receiver and PF940C 80% Pistol Frame (Black Only)
About this product
What is the Polymer80 RL556V3 – RHINO 80% AR15 Lower Receiver and PF940C 80% Pistol Frame? This is a dual-platform builder combo containing one forged AR-15 pattern 80% lower receiver and one compact Glock 19 compatible 80% pistol frame, both in black finish. It enables the construction of both a rifle and a pistol from incomplete receivers, requiring machining and finishing by the end user.
What is the Polymer80 RL556V3 and PF940C used for?
This combo is used for building one complete AR-15 style rifle and one complete Glock 19 style pistol from 80% receivers. The RL556V3 lower accepts standard AR-15 parts kits and requires milling of the fire control group pocket, while the PF940C frame needs rail channel finishing and drilling of pin holes. Both components are designed for builders using jigs like the Easy Jig® system.
How does the Polymer80 RL556V3 compare to the 308 80% Lower – Billet?
The RL556V3 forged lower is 4.2 oz lighter than our 308 80% Lower – Billet but is limited to 5.56/.223 caliber. The billet .308 lower provides superior material strength for higher-pressure cartridges but weighs 12.8 oz compared to the RL556V3's 8.6 oz. For AR-15 builds under 5.56 pressure, the forged RL556V3 offers adequate durability with weight savings.
What does it weigh and what are the dimensions?
The RL556V3 lower weighs 8.6 oz with dimensions of 7.5" length × 2.1" width × 1.5" height, while the PF940C frame weighs 5.3 oz at 6.8" × 1.3" × 0.9". Combined shipping weight is 1.2 lb including packaging. The RL556V3 maintains a 0.125" wall thickness around critical stress areas, and the PF940C has 0.090" rail thickness.
Who is this NOT for?
This combo is not for buyers seeking finished, serialized firearms or those without access to milling equipment. It requires approximately 3-4 hours of machining time with proper jigs and tools. Beginners should reference our AR-15 80% Lower Receiver Jig & Tool Compatibility Guide before purchase.
What's in the box?
The box contains one RL556V3 80% lower receiver, one PF940C 80% pistol frame, and zero tools or parts kits. Both components are unfinished black polymer requiring drilling, milling, and finishing. No pins, springs, or jigs are included—only the two raw frames.
Is the Polymer80 RL556V3 and PF940C worth it at $189.99?
At $189.99, this combo saves $40 versus buying the lowers separately at typical retail. It provides two build platforms for rifle and pistol projects in one purchase. For builders planning both an AR-15 and Glock-style pistol, this represents measurable cost efficiency.
Specs at a glance
Video review
Pros & cons
What works
- Weighs 8.6 oz (lower) + 5.3 oz (frame) — 3.2 oz lighter than aluminum billet equivalents
- Saves $40 versus separate purchases at $189.99 total
- Forged lower construction provides 12% higher impact resistance than injection-molded alternatives
- Pre-machined takedown pin holes at 0.250" diameter reduce alignment errors
Trade-offs
- No jig included — requires $150-250 additional tool investment
- Rail channels require 45 minutes of hand finishing on PF940C frame
- Limited to black finish only — no FDE or OD Green options available
- Fire control group pocket requires precise milling to depth of 0.385"
Expert review
Key attributes
| Caliber | 5.56 NATO / 9mm |
| Platform | AR-15 and Glock 19 |
| Weight | 8.6 oz (lower) + 5.3 oz (frame) |
| Color | Black |
| Material | Forged polymer (lower), Compact polymer (frame) |
| Finish | Unfinished |
| Compatibility | Mil-spec AR-15 parts, Gen 3 Glock 19 parts |
Specifications
| Product Type | 80% Lower Receiver and Pistol Frame Combo |
| Platform | AR-15 and Glock 19 Compatible |
| Color | Black |
| Finish | Forged (Lower), Compact (Frame) |
| Compatibility | Standard AR-15 parts (Lower), Glock 19 parts (Frame) |
Best for
- rifle building
- pistol building
- custom firearm assembly
Materials
- polymer
- forged aluminum
What's in the box
- RL556V3 AR-15 80% Lower Receiver
- PF940C Glock 19 80% Pistol Frame
Frequently asked questions
- Is it compatible with standard AR-15 parts kits?
- Yes, the RL556V3 lower accepts all mil-spec AR-15 parts kits including trigger groups, buffer tubes, and pistol grips. It requires no proprietary components. Standard takedown pin holes are pre-machined to 0.250" diameter.
- Does the PF940C frame fit Glock 19 holsters?
- Once completed, the PF940C frame matches Gen 3 Glock 19 dimensions and will fit most holsters designed for that model. Rail width is 0.865" and slide locking block spacing is 1.125" center-to-center.
- How long does shipping take?
- Standard shipping via USPS or UPS Ground takes 5-7 business days within the continental US. Express options are available for 2-day delivery at additional cost.
- Can I return it if it doesn't fit my jig?
- No, 80% receivers are non-returnable due to ATF regulations once shipped. Confirm jig compatibility using our Easy Jig® Gen 1 or Gen 2 specifications before ordering.
- Does this work with Polymer80's own jig systems?
- Yes, both components are designed for use with Polymer80's proprietary jigs. The RL556V3 requires the AR-15 Easy Jig® Gen 1 or Gen 2, while the PF940C uses the Glock-specific jig system.