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80% Lower News

AB 857 and Building an 80% Lower for Your 300 Blackout in CA

AB 857 and Building an 80% Lower for Your 300 Blackout in CA

California's gun laws are an infuriatingly confusing and complex minefield, aren't they? Let's walk you through navigating that mine field, so you can legally build your own 80% lower and 300 Blackout rifle. Now, this article won't dive into the nuances of what makes an AR 15 (regardless of caliber) legal in California - that's an entirely different topic all itself. What we will detail are California's latest gun laws that relate to finishing an 80% lower - the biggest roadblock to homebuilding your own AR 15 in 300 Blackout from start to finish. There is one major law that affect...

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Mystery Maker Claims to Develop 900-Meter 300 Blackout Round

Mystery Maker Claims to Develop 900-Meter 300 Blackout Round

No, you’re not reading that headline incorrectly. Trom Munitions, an unknown cartridge developer once called PNW Arms and Valiant Firearms, claims to have made a 300 Blackout cartridge capable of reliably hitting out to 900 meters. If you’ve been a loyal reader, you saw our article headlining the max effective range of 300 Blackout to be somewhere around 400-meter mark. What gives? Trom Munitions goes so far as to claim their magical uniform 300 BLK round has a 100% chance of hitting an official IDPA Silhouette-sized target at this distance, while maintaining over 400 joules of energy. We took issue with some...

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300 Blackout vs 9mm Parabellum

300 Blackout vs 9mm Parabellum

The pistol-cartridge segment of the AR market is picking up steam – we even sell a very cool and proprietary AR-9 Complete Build Kit on our sister site, 80-Lower.com. We know that the MP5 reigned supreme as a close-quarters, suppressed weapon and PDW for decades. But now, 300 Blackout SBRs and pistols seem to be filling that slot for the military. So, which is better? 300 Blackout and 9mm by The Numbers First, let’s break down the ballistic data of both cartridges. Keep in mind, these averages are based on each round being fired from a 16” barrel. Because 9mm is...

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Review: Premium 300 BLK Billet Black 80% Lower

Review: Premium 300 BLK Billet Black 80% Lower

There’s a lot of buzz about building black rifles at home, and many folks have been assembling their .223 and 5.56 ARs in the comfort of their garages and basements for quite some time. With the introduction and rising popularity of 300 BLK, we only figured it’s fitting that we review the core of the idea of building your own 300 Blackout rifle or pistol at home: The 80% lower. Our premium billet 80% lower, to be exact. It’s one of the most popular currently available on the AR 15 market, and for good reason. Let’s dive into why it’s...

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How Does a 300 BLK Suppressor Work?

How Does a 300 BLK Suppressor Work?

300 Blackout deserves a suppressor. Let’s face it, the round was designed with this intent in mind. After all, few other (if any) rifle platforms and cartridge combinations can go from supersonic to subsonic, un-suppressed to suppressed, with just the threading of a can on the muzzle. If you don’t eventually invest in a suppress for your 300 BLK rifle or pistol, you’re missing out. If you’re reading this, though, we can be confident you’re interested. So, how does a suppressor, or “can”, work? Let’s find out: Why Guns are Loud: Sonic Booms and Explosions To understand how a suppressor...

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