Blemished – 80% Lower Fire/Safe Marked – Anodized Black
About this product
What is the Trigger Logic Blemished 80% Lower Fire/Safe Marked Anodized Black? It's a forged 7075-T6 aluminum AR-15 lower receiver with minor cosmetic flaws that functions identically to premium receivers at 40% lower cost. This 80% complete lower requires final machining by the builder using a compatible jig system like our 80% AR-15 Easy Jig® Gen 1, making it ideal for experienced builders prioritizing performance over perfection.
What is the Trigger Logic 80% Lower used for?
This lower serves as the foundation for custom AR-15 builds requiring final machining of the fire control group pocket and trigger pin holes. You'll need a drill press or router, appropriate end mills like our 5/16″ High Speed End Mill, and approximately 45-60 minutes of precise work to complete the receiver to 100% functional status.
How does the Trigger Logic 80% Lower compare to a Polymer80 PF940V2?
The Trigger Logic aluminum lower provides superior rigidity and heat resistance compared to polymer alternatives like the Polymer80 PF940V2. While the Polymer80 weighs 5.2 oz, this forged aluminum lower weighs 8.4 oz and maintains dimensional stability across a wider temperature range (-40°F to 250°F), making it better for high-volume fire or extreme environment builds.
What does it weigh and what are the dimensions?
This lower weighs 8.4 oz (238 grams) with dimensions of 7.625 inches long, 2.25 inches wide, and 1.5 inches tall. The fire control pocket requires milling to a depth of 0.860 inches, and the trigger pin holes must be drilled to 0.154 inches diameter with centers spaced 0.250 inches apart.
Who is this NOT for?
This blemished lower isn't for builders seeking showroom-perfect aesthetics or those without machining experience. The cosmetic flaws—typically minor scratches or discoloration under 0.5mm deep—remain visible after finishing, and improper machining can ruin the receiver, as detailed in our guide on jig alignment pin specifications.
What's in the box?
The box contains one 80% complete lower receiver, nothing else. You'll need to source all pins, springs, trigger components, and a buffer tube separately—unlike our .308 Lower Parts Kit which includes everything except the receiver itself.
Is the Trigger Logic 80% Lower worth it at $89?
At $89, this lower delivers 100% functionality at 40% savings over non-blemished versions costing $149. The forged 7075-T6 aluminum withstands over 75,000 rounds of testing, and the anodized finish provides 500+ hours of salt spray corrosion resistance, making it worth every penny for builders who value performance over cosmetics.
Specs at a glance
Video review
Pros & cons
What works
- Forged 7075-T6 aluminum — 82% stronger than 6061-T6 alloy
- Weighs 8.4 oz — 3.2 oz heavier than polymer lowers for better stability
- Anodized finish withstands 500+ hours salt spray testing
- Saves $60 vs non-blemished versions at identical functionality
Trade-offs
- Cosmetic blems average 0.3-0.5mm deep — visible after finishing
- No jig included — adds $120-180 for proper tooling
- Requires precise machining — ±0.005" tolerance critical for function
Expert review
Key attributes
| Material | Forged 7075-T6 Aluminum |
| Finish | Type III Anodized Black |
| Weight | 8.4 oz |
| Dimensions | 7.625" L x 2.25" W x 1.5" H |
| Compatibility | Mil-Spec AR-15 |
| Engravings | Fire/Safe Marked |
| Condition | Blemished (cosmetic only) |
| Completion | 80% |
Specifications
| Material | Forged 7075-T6 Aluminum |
| Finish | Anodized Black |
| Compatibility | AR-15 |
| Engravings | Fire/Safe Marked |
| Condition | Blemished (cosmetic only) |
| Completion | 80% |
| Stock Status | In stock, ships today |
Best for
- Custom AR-15 builds
- Firearm manufacturing projects
- Home gunsmithing
Materials
- 7075-T6 Aluminum
What's in the box
- Blemished 80% Lower Receiver
Care
Frequently asked questions
- Is it compatible with Mil-Spec AR-15 parts?
- Yes, it accepts all Mil-Spec components including trigger groups, pistol grips, and buffer tubes. The fire control pocket requires milling to standard dimensions: 0.860" depth x 0.530" width, with trigger pin holes at 0.154" diameter spaced 0.250" apart.
- Does it fit standard AR-15 jigs?
- It works with Polymer80 Easy Jig Gen 1-3 systems and most commercial jigs using 0.250" alignment pins. For precise execution, follow our <a href="/blog/80-lower-jig-rental-program-trigger-logic-compatible/">jig rental compatibility guide</a> to avoid tolerance stacking issues.
- How long does shipping take?
- Orders ship within 24 hours via USPS Priority Mail (2-3 days) or UPS Ground (3-5 days). We process all orders before 3 PM EST same day, with tracking provided within 2 hours of shipment confirmation.
- Can I return it if I mess up the machining?
- No, returns aren't accepted for user-damaged receivers. Once you begin machining, the receiver is considered custom-finished per ATF guidelines. We recommend practicing on aluminum scrap first—allow 30-45 minutes for setup and testing before working on the actual lower.