80% Lower + Stripped Upper Receiver Set ^

80% Lower Receiver and Stripped Upper Receiver Set - Cerakote and Engraving Options

Build your dream AR-15 from the ground up with this premium stripped upper receiver and 80% lower receiver bundle. Machined to exacting standards from top-grade aluminum, both receivers deliver exceptional durability, reliability, and compatibility with standard AR-15 components. Customize your set by choosing from seven distinct finishes to achieve the exact look and performance you desire:

1. Raw Aluminum – Perfect for those who plan to apply a custom finish or admire the raw, industrial aesthetic.
2. Black Anodized – A timeless, MIL-SPEC–inspired coating for robust wear and corrosion resistance.
3. FDE Cerakote – A popular flat dark earth color that lends a tactical, modern edge.
4. Sniper Gray Cerakote – Clean, refined, and understated—great for creating a stealthy style.
5. OD Green Cerakote – Blends naturally with outdoor environments while offering a rugged, classic look.
6. Burnt Bronze Cerakote – A striking metallic tone that stands out with warmth and durability.
7. Tungsten Cerakote – A bold gray finish that merges contemporary style with tough protection.

80% Lower Receiver

• 80% Complete: Requires additional milling (including the fire control group area) to become a fully functional lower.
• No FFL Needed: In most jurisdictions, 80% lowers can ship directly to your door—verify your local laws before purchasing or completing the receiver.
• High-Quality Construction: Precision-machined to strict tolerances for consistent, reliable performance once finished.
• 7075 aluminum
• T6 Heat treated
• Magwells are flared and broached

Stripped Upper Receiver

• Ready for Your Components: Add your choice of barrel, handguard, bolt carrier group, and other components for a truly tailored build.
• Precision-Machined: Ensures a precise fit to the corresponding 80% lower for optimal alignment and reliability.
• Compatible with Standard AR-15 Parts: Build with the aftermarket parts you prefer without hassle.
• Machined from 7075 T6 Forgings
• Mil-Std 1913 Rail for mounting optics and accessories
• Machined for use with barrels that use an M4 barrel extension
• M4 Feedramps
• Made in the U.S.A

Combine the stripped upper receiver with this 80% lower receiver to kick off your next custom AR-15 project. With seven finish options available, it’s never been easier to craft a rifle that reflects your style—backed by quality manufacturing you can count on every step of the way.

RTB is offering 80% lower receivers pre-engraved with whatever serial number and manufacturer information you want. We typically engrave to a depth of .01" and you will need to fill out the following information in the text boxes above:

You can have any of the 5 lines below engraved. Pick and choose if you like, but we recommend using all of them. We recommend using all capital letters, but we will engrave exactly what you type.

1. Name of Person or Entity (This can be your personal name, trust name, etc.)

2. City & State

3. Model (This can be whatever you want) **DEFAULT PREFIX = "MOD:"

4. Caliber ("MULTI" is a good choice but you can choose whatever caliber you want) **DEFAULT PREFIX = "CAL:"

5. Serial Number (This should be unique and should not match any of the serial numbers that you currently own or have manufactured. If you add the same lower multiple times, we will continue the serial number sequence for you.). **DEFAULT PREFIX = "S/N:"

***YOU MUST SPECIFICALLY REQUEST IN THE "ORDER COMMENTS" SECTION THAT WE ARE NOT TO ENGRAVE THE DEFAULT PREFIXES IF YOU DO NOT WANT THEM.***

• Please add multiple lowers to the cart for unique serial numbers. If you add the same lower multiple times, we will continue the serial number sequence for you.
• If you select to have safety engravings the Engraving will be on both sides of lower.

Important: Check all applicable laws and regulations regarding ownership and completion of 80% lowers before purchase.
Please note: We will not ship 80% blanks to the following states: NY, NJ, D.C., CT, HI, CA, MD, WA, DE, NV, IL and RI. This is not legal advice, and we encourage you to check your local and state laws prior to ordering.

Please note: Some states may not allow you to legally manufacture a firearm. Please be sure to do your due diligence and make sure you are following your state and local laws before attempting to manufacture a firearm. This is not intended and should not be construed as an advertisement or offer for sale of any of our products to New Jersey residents or any person in New Jersey.

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ENGRAVING REFERENCE CHART


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