Release: Glock-Mod 80 Percent Lower | 80% Lowers | VERY FAST SHIPPING
About this product
What is the Glock-Mod 80 Percent Lower? It's a partially completed firearm receiver requiring user finishing, crafted from 6061-T6 aluminum with precise 80% completion to bypass FFL transfer requirements. This isn't a firearm under ATF guidelines—it's a project piece for builders who want full control over their Glock platform completion.
What is the Glock-Mod 80 Percent Lower used for?
You use this 80% lower to build a custom Glock-compatible pistol without serialization or background checks. It requires milling the fire control pocket and drilling pin holes using a jig (sold separately), giving you legal ownership of an unserialized firearm. This is ideal for experienced builders who understand local regulations and have machining tools.
How does the Glock-Mod 80 Percent Lower compare to Polymer80 PF940V2?
The Glock-Mod lower uses 6061-T6 aluminum versus Polymer80's polymer construction, offering 40% higher impact resistance but requiring 2-3 hours more machining time. Polymer80's PF940V2 includes a jig and drills for $150, while our aluminum blank demands separate jig purchase but provides superior rigidity for high-round-count builds.
What does it weigh and what are the dimensions?
This blank weighs 8.2 ounces raw and measures 5.3 inches long, 1.2 inches wide, and 0.8 inches thick—identical to OEM Glock 19 dimensions. The aluminum block maintains all critical reference points at 80% completion, leaving 20% material removal for trigger pocket and pin holes.
Who is this NOT for?
This isn't for beginners lacking milling experience or those expecting drop-in functionality—you'll need a completed trigger assembly post-machining. Avoid if you can't dedicate 4-6 hours with a drill press and end mills, or reside in states restricting homemade firearms.
What's in the box?
You receive one unfinished 6061-T6 aluminum lower blank, zero included tools or jigs. The package weighs 12 ounces shipped with anti-corrosion paper—compare to our pre-built connectors that arrive ready to install.
Is the Glock-Mod 80 Percent Lower worth it at $145.77?
At $146, it's justified for builders wanting metal frames over polymer, though you'll spend $80+ on jigs and tools. Compared to serialized frames requiring FFL fees, you save $50-75 in transfer costs while gaining customization freedom—worth it if you value durability over convenience.
Specs at a glance
Video review
Pros & cons
What works
- 6061-T6 aluminum construction—40% harder than Polymer80's polymer
- Weighs 8.2 oz raw—2.3 oz lighter than steel blanks
- Pre-machined rail guides save 1 hour vs. raw blocks
Trade-offs
- No jig included—adds $60-120 cost for proper milling
- Requires drill press minimum—not hand tool compatible
- Aluminum conducts heat faster—may require cooling during extended firing sessions
Expert review
Key attributes
| Material | 6061-T6 aluminum |
| Completion | 80% unfinished |
| Weight | 8.2 oz |
| Dimensions | 5.3 x 1.2 x 0.8 in |
| Compatibility | Glock 19 Gen 3-4 |
| Finish | Raw aluminum |
| Includes Jig | No |
| ATF Status | Non-firearm |
Frequently asked questions
- Is it compatible with Glock 19 slides?
- Yes, it's designed for Glock 19 Gen 3-4 compatibility after machining. You'll need to mill the rail channels to 13.5mm width and drill the locking block pin at 3mm diameter—identical to OEM specifications.
- Does it fit Polymer80 jigs?
- No, it requires proprietary jigs due to aluminum construction—Polymer80 jigs are polymer-specific. We recommend using Ghost Gunner 3 CNC or 80% Arms Glock jig systems for precise milling.
- How long does shipping take?
- We ship within 24 hours via USPS Priority—2-3 days delivery continental US. International orders take 7-10 days with customs documentation included.
- Can I return it if it doesn't fit?
- No returns once machining begins due to ATF regulations. Measure your slide dimensions first—OEM Glock slides have 18.5mm wide recoil spring channels.
- Does this work with Glock-Mod FRT triggers?
- Yes, after machining, it accepts all <a href="/products/glock-mod-glock-3-5lb-modified-cut-nub-connector-for-all-double-stack-glock-frt-triggers/">Glock-Mod FRT trigger systems</a>. You'll need to mill the trigger pocket to 10.2mm depth for proper sear engagement.