How to Make Your AR-15 Legal in California

Posted by 80-Lower.com on Jun 2nd 2025

California has some of the strictest gun laws in the country, especially when it comes to the AR-15. The state's legislature has placed many restrictions on how, exactly, an AR-15 can be legally configured. There are numerous parts you can't legally install. But with the right ones, you can still en …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

Yes, Building Your AR-15 is Better Than Buying

Posted by 80-Lower.com on May 20th 2025

It's an argument as old as the internet: Should you build your AR-15, or just buy a rifle off the shelf of your local gun dealer? Building vs. Buying Your AR: Which is Better? We'll keep it simple. Building your AR-15 is objectively better, and for plenty of reasons. here's why. Building Your Rifle …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

Why You Shouldn't use (Some) 5.56 Mags for 300 BLK

Posted by 80-Lower.com on Apr 14th 2025

We've explained parts compatibility in our 300 Blackout AR-15 build guide. In that guide, we explained how, technically, the .300 AAC Blackout cartridge can be stacked in standard 5.56 NATO magazines -- but there's a critical caveat that needs to be covered. The short n' sweet summary is this: Alth …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

4150 vs. 416R Stainless: Which AR Barrel & When?

Posted by 80-lower.com on Mar 17th 2025

Stainless barrels have gained popularity rapidly. In the past few years, they've taken the AR-15 market by storm. Nowadays, you'll find plenty of accuracy-focused upper receivers and prebuilt rifles configured with 416R stainless barrels. But 4150 barrels -- commonly called "carbon steel" barrels -- …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

AR-15 vs. M16: The Real Differences (And Similarities)

Posted by 80-lower.com on Mar 14th 2025

You may be familiar with the basic history of the AR-15: Eugene Stoner developed the .308-chambered AR-10 in the late 50s, shrunk the rifle down, chambered it in .223 Remington, and called it the AR-15. In 1963 (after ArmaLite sold the rights to the AR-10 and AR-15 platforms to Colt) the military ad …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

Should You Lap Your AR-15 Upper? (Yes! Here's Why & How)

Posted by 80-lower.com on Mar 3rd 2025

The AR-15's capable of incredible accuracy, and it's one of the most reliable firearms ever designed. But its mass production, myriad manufacturers, those makers' tendencies to focus on affordability, and the classic effect of "tolerance stacking" (small imperfections in components adding up to noti …

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.