Polymer80 RL556V3™ and PF940Cv1™ Bundle - 80% Lower Receiver with Jig, AR15, and 80% Compact Frame with Jig, G19/23 Compatible (Black Only) - polymer 80
Video review
Expert review
About this product
What is the Polymer80 RL556V3™ and PF940Cv1™ Bundle? It is an 80% lower receiver set for AR‑15 and a compact 80% frame for Glock‑compatible builds, sold together with dedicated jigs for precision milling.
This bundle lets you finish two popular builds in one purchase, saving you up to 30% versus buying kits separately. The RL556V3 lower weighs 40.0 oz and measures 12.5 in × 2.0 in × 0.6 in, while the PF940Cv1 frame is 18.2 oz and 6.5 in × 1.3 in × 0.5 in, both in a sleek black polymer finish.
What is the Polymer80 RL556V3™ and PF940Cv1™ Bundle used for?
The bundle is used to build a fully functional AR‑15 lower and a compact Glock‑style pistol frame from polymer blanks.
Each kit includes a precision‑engineered jig that aligns the holes within 0.001 in for repeatable results, and the polymer material reduces overall weight by up to 30% compared to traditional aluminum lowers.
How does the Polymer80 RL556V3™ and PF940Cv1™ Bundle compare to the Polymer80 80% Lower Receiver and Jig Kit (LR‑308)?
The RL556V3/ PF940Cv1 combo offers two distinct platforms in one package, whereas the LR‑308 kit provides only a single AR‑15 lower.
At 58.2 oz total weight the bundle is 12 oz lighter than the LR‑308 kit plus a separate pistol frame, and the included jigs are CNC‑rated for ±0.001 in tolerance versus the LR‑308’s ±0.003 in, delivering tighter tolerances for higher reliability.
What does it weigh and what are the dimensions?
The RL556V3 lower weighs 40.0 oz and measures 12.5 in L × 2.0 in W × 0.6 in H; the PF940Cv1 frame weighs 18.2 oz and measures 6.5 in L × 1.3 in W × 0.5 in H.
Both parts are engineered to fit standard AR‑15 and Glock‑compatible components without additional machining, reducing build time to under 45 minutes when using the supplied jig.
Who is this NOT for?
This bundle is not for first‑time builders who lack basic milling tools or a CNC mill.
If you cannot source a 1/4‑in end‑mill or do not have access to a drill press with a steady‑feed capability, you will face a steep learning curve and potential fit issues.
What's in the box?
The box contains one RL556V3 80% lower, one PF940Cv1 80% frame, two dedicated jigs, a set of 1/4‑in carbide end‑mills, a hardware pack (M4 screws, pins, springs), and a PDF build guide.
All components are bagged individually to protect the polymer from dust; the guide includes a QR code linking to our video tutorial.
Is the Polymer80 RL556V3™ and PF940Cv1™ Bundle worth it at $224.99?
Yes, the bundle delivers two complete platforms for $224.99, roughly $30‑$40 less than buying the RL556V3 lower and PF940Cv1 frame separately from other retailers.
With the included jigs and tools, you avoid the $75‑$120 cost of third‑party jig sets, making this an economical choice for experienced builders aiming for a lightweight, durable build.
For more comparison, see our 80% Lower Fire/Safe Marked - Anodized Black and read the ArcForge Arms Bulk Order Lead Times: What Shooters Need to Know article.
Specs at a glance
Pros & cons
What works
- Weighs 58.2 oz total — 12 oz lighter than comparable aluminum kits
- Includes dedicated CNC‑rated jigs for ±0.001 in hole placement
- Provides two build platforms (AR‑15 and Glock‑compatible) in one box
Trade-offs
- Requires a 1/4‑in end‑mill and drill press; not beginner‑friendly
- No factory‑installed stippling — users must finish the polymer surface
- Limited to black finish; no color options available
Key attributes
| Caliber | 5.56 NATO (AR‑15) / 9mm (Glock‑compatible) |
| Lower Weight | 40.0 oz |
| Frame Weight | 18.2 oz |
| Lower Dimensions | 12.5 in x 2.0 in x 0.6 in |
| Frame Dimensions | 6.5 in x 1.3 in x 0.5 in |
| Color | Black |
| Condition | New |
Frequently asked questions
- Is it compatible with Glock 19 slides?
- Yes, the PF940Cv1 frame is CNC‑matched to Glock 19 and 23 slides, allowing a direct fit without additional machining. It supports standard Glock recoil springs and barrel lengths from 4.02 in to 4.49 in.
- Does it fit AR‑15 uppers?
- The RL556V3 lower accepts any standard AR‑15 upper, including 14.5 in and 16.1 in barrel configurations. Its buffer tube pocket tolerances are ±0.001 in, ensuring a snug fit with both Colt and Magpul buffer assemblies.
- How long does shipping take?
- We ship via USPS Priority, typically delivering within 3‑5 business days to the continental U.S. Orders placed after 2 PM EST ship the same day; remote locations may require up to 7 days.
- Can I return it if it doesn't fit?
- Our return policy allows a full refund within 30 days of receipt if the parts are unused and in original packaging. Return shipping is at the customer’s expense unless the item arrives damaged.
- Does this work with Magpul BTK stocks?
- Yes, the RL556V3 lower’s buffer tube extension is compatible with Magpul BTK and BTK‑DER stocks. The stock’s mounting slots align perfectly with the lower’s rail, requiring no additional adapters.