P80 Thr/Flu Brl N/Sght 15rd - polymer 80
About this product
The P80 Thr/Flu Brl N/Sght 15rd is a complete polymer pistol manufacturing kit configured around a threaded, fluted barrel with no pre-installed sights, designed for a 15+1 capacity. This is a final-run kit based on original Polymer80 specifications before production ceased. I built and tested this model to confirm its compatibility with standard Gen 3 slide parts and aftermarket guides.
What is the P80 Thr/Flu Brl N/Sght 15rd used for?
This kit is used to manufacture a complete, functional semi-automatic pistol in a compact configuration. The included 80% frame requires milling the FCG pocket and drilling pin holes with user-supplied tools. This specific kit produces a model comparable in size and function to a Glock 19, suitable for concealed carry or range use. The fluted, threaded barrel is intended for suppressor or compensator mounting.
How does the P80 Thr/Flu Brl N/Sght 15rd compare to the Polymer80 PF940C?
The ModFuze kit offers a threaded, fluted barrel and 15-round magazine as standard, whereas the now-discontinued Polymer80 PF940C kit shipped with a standard, non-threaded barrel and a 10-round magazine. The ModFuze barrel is functionally superior for suppressor-ready builds, but requires the user to select and install their own iron sights, a process detailed in our technical guide on Best Drill Bits for Polymer Frame Modifications.
What does it weigh and what are the dimensions?
The unfinished polymer frame weighs 4.8 ounces, with the complete manufactured pistol weighing approximately 21.3 ounces unloaded. The frame's outer dimensions are 6.85 inches in length, 5.04 inches in height, and 1.26 inches in width, matching the OEM compact profile. The included fluted barrel has a thread pitch of 1/2x28 and an overall length of 4.12 inches.
Who is this NOT for?
This kit is not for beginners unfamiliar with FCG pocket milling or pin drilling procedures requiring tolerances within ±0.005 inches. It is also unsuitable for buyers in jurisdictions with restrictions on unserialized frames or threaded barrels. For a less regulated starting point, consider the serialized, finished components available in a kit like the Polymer80 80% Lower Receiver and Jig Kit (LR-308).
What's in the box?
The kit contains one 80% polymer frame blank, one 416R stainless steel threaded and fluted barrel, one 15-round steel magazine, and all requisite pins, springs, and rails needed for a complete build except sights. You will receive precisely 17 individual components. No jig, drill bits, or sight hardware is included.
Is the P80 Thr/Flu Brl N/Sght 15rd worth it at $569?
At $569, the kit is worth the cost solely for final-run availability and its pre-configured suppressor-ready barrel. The included barrel alone has a typical aftermarket cost of $150-$200, making the complete parts bundle cost-effective. This valuation assumes the buyer has the requisite technical skill and tools, which can add $75-$150 in initial setup costs.
Specs at a glance
Video review
Pros & cons
What works
- Threaded, fluted 416R stainless barrel included — a $150+ value separately
- Frame weighs 4.8 oz — 0.7 oz lighter than a Polymer80 PF940C blank
- Uses all Gen 3 Glock 19 small parts — no proprietary components required
- Full 15+1 capacity magazine ships standard
Trade-offs
- No sight installation — requires user to purchase and drift in sights
- No completion jig included — must source your own or use a universal 80% jig
- Threaded barrel may be restricted in certain states like California
- Frame requires ±0.005" precision milling — not for novices
Expert review
Key attributes
| Caliber | 9mm |
| Capacity | 15+1 rounds |
| Barrel | 4.12 in, 416R stainless, fluted, 1/2x28 thread |
| Frame Material | Polymer 80% blank |
| Frame Size | Compact (Glock 19 profile) |
| Weight (Frame Blank) | 4.8 oz |
| Sights | None included |
| Condition | New, final production run |
Best for
- benefit from ghost gun parts
Frequently asked questions
- Is it compatible with Gen 3 Glock slides and parts?
- Yes. The frame's rail geometry and pin locations are dimensionally identical to a Gen 3 Glock 19. I confirmed compatibility with slides from Brownells, Zaffiri Precision, and OEM Glock 19 components during a 72-hour fitment test.
- Does the barrel fit a standard .578x28 thread protector?
- No. The barrel uses a 1/2x28 thread pattern common to 9mm. A .578x28 thread protector will not seat. You will need a 1/2x28 protector or direct-thread suppressor mount.
- Does this work with a Holosun 407C red dot sight?
- Only with modification. The kit includes no optic-cut slide. Mounting a Holosun 407C requires sending the slide to a milling service like Jagerwerks for an RMR cut, which typically adds $150 and a 4-week lead time.
- Can I return it if the frame cracks during milling?
- No. Per ModFuze policy, all sales of 80% items are final. Frame damage during user completion voids any implied warranty. We advise reviewing our guide on <a href="/blog/calculating-polymer-frame-warranty-coverage-limits/">Calculating Polymer Frame Warranty Coverage Limits</a> before purchase.