P80 vs G80: How the Polymer80 Frame and G80 Compare
Polymer80 frames are no longer made. Here is how the P80 and the G80 compare, from the steel receiver to swappable grip modules, and which of your P80 parts still fit.
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What is The Best 80 Percent Lower?
“Which 80% lower is the best” Is a question we get asked frequently by AR-15 builders and new customers. The answer to that question depends on what type of AR you’re building, and what tools you have access to. Of course, there is generally one overall best choice when it comes to putting together a…
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80% Lowers and the ATF Frame or Receiver Rule: FAQ
Updated October 30, 2026 What Did The ATF Do? On August 24, 2022, the ATF’s Final Rule ( 2021R-05F), went into effect. This rule attempts to restrict the manufacturing, sale, and ownership of unfinished 80% lowers, 80% frames. Under this rule, 80-Lower.com and other, similar businesses are restricted from selling some of our products to…
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P80 (Gen 3) vs GLOCK (Gen 5) Slides: What’s Different?
We’ve covered the differences between the Polymer80 (Gen 3) frame, and the Gen 5 GLOCK frame. But what about the slides? Are their parts interchangeable? Can you fit a Gen 3 slide on a Gen 5 frame? Let’s take a look. Gen 3 vs Gen 5 GLOCK Slides Compared For this comparison, we’re looking at…
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P80 vs GLOCK Frames: What’s Different?
Polymer80’s frames — and the handguns that are built on those frames — have gained popularity among mainstream firearm owners. These frames and guns easy to customize, and they use GLOCK parts. But P80-based pistols are not identical to modern, Gen 5 GLOCK pistols. That’s because they use “Gen 3” (older) GLOCK parts. Polymer80 no…
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80% Frame Compatibility Guide
The GLOCK® and 1911 handguns are perhaps two of the most popular firearms in America. It’s no surprise 80% frames have been made for custom builds. This guide compares frame blank compatibility with handgun models, calibers, and parts. The G80: Today’s Glock-Compatible 80% Build For a side-by-side comparison, read P80 vs G80: How the Polymer80…
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80% Lower Compatibility Guide
You’re ready to become an at-home gunsmith and build an AR-15 from scratch. But which receiver blank should you buy? This guide compares available AR-type 80% lowers, which calibers they work with, and other specifications you’ll need to know before building. New here? Read “What is An 80% Lower?” Need to find the right lower…
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What Is an 80 Percent Lower?
When you build an AR-15, you always start with the stripped lower receiver. Why? Because, legally, it’s the regulated firearm component of the entire rifle or pistol. All the other parts you need to build an AR are not regulated, serialized, or controlled by the Bureau of Alcohol, Tobacco, and Firearms (ATF). But even though…
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Billet vs. Forged: Which Receivers Are Best?
If you’re building an AR-15 — or even just buying one — you’ve hit this fork in the road: Should you choose billet or forged upper and lower receivers? It’s a deceptively simple choice that can have a big impact on how your AR performs and how much it costs, and what parts you can…
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Video: Forged VS Billet 80 Lower Receiver
Still deciding what type of 80 Lower Receiver to buy? There are two popular types of 80 lowers for sale. In this video we explain the differences between billet and forged 80% lowers. Forged and Billet describe the way that the 80 lower is manufactured. In this video we also take a closer look in the…
