.300 Blackout vs 5.56: Suppressed Build Comparison
.300 Blackout vs 5.56: Suppressed Build Comparison. AT3 Tactical's Josh tests a purpose-built .300 BLK suppressed rifle against 5.56 and discovers why subsonic loads and short barrels change everything. { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://greyhive.com#organization", "name": "Greyhive", "url": "https://greyhive.com", "description": "Greyhive is a censorship-resistant video platform for the firearms, 2A, hunting, and outdoor industries — where creators build, review, and monetize unfiltered content.", "logo": { "@type": "ImageObject", "url": "https://greyhive.com/static/uploads/images/ae198483-01c9-44b4-a16a-03f516ceaf66.svg", "width": 512, "height": 512 }, "sameAs": [ "https://x.com/greyhive", "https://www.instagram.com/greyhive/", "https://www.youtube.com/@Greyhive", "https://www.linkedin.com/company/greyhive/" ] }, { "@type": "WebSite", "@id": "https://greyhive.com#website", "url": "https://greyhive.com", "name": "Greyhive", "description": "Greyhive is a censorship-resistant video platform for the firearms, 2A, hunting, and outdoor industries — where creators build, review, and monetize unfiltered content.", "publisher": { "@id": "https://greyhive.com#organization" } }, { "@type": "Person", "@id": "https://greyhive.com/c/at3_tactical#person", "name": "AT3 Tactical", "url": "https://greyhive.com/c/at3_tactical", "description": "AT3 Tactical is a Greyhive creator producing original 2A, firearms, hunting, and outdoor content.", "image": "https://greyhive.com/lazy-static/avatars/8f7fa00a-8de6-4698-96d3-ae58be3f5166.jpg" }, { "@type": "Article", "@id": "https://greyhive.com/blog/300-blackout-vs-556-suppressed-rifle-test#article", "isPartOf": { "@id": "https://greyhive.com#website" }, "mainEntityOfPage": { "@id": "https://greyhive.com/blog/300-blackout-vs-556-suppressed-rifle-test" }, "url": "https://greyhive.com/blog/300-blackout-vs-556-suppressed-rifle-test", "headline": ".300 Blackout vs 5.56: Suppressed Build Comparison", "name": ".300 Blackout vs 5.56: Suppressed Build Comparison", "description": "AT3 Tactical's Josh tests a purpose-built .300 BLK suppressed rifle against 5.56 and discovers why subsonic loads and short barrels change everything.", "articleSection": "Gun Reviews", "articleBody": "If you have been trying to decide between .300 Blackout vs 5.56 for a suppressed build, the honest answer from AT3 Tactical is that they are not competing for the same job. In his range test on Greyhive, host Josh spends the first half of the video arguing that 5.56 is the better buy for almost everyone — cheaper, more available, and effective well past 300 yards — and he does not walk that back. What changes is the question. Co-host CJ built a .300 BLK rifle specifically to win one argument: short, suppressed, subsonic. A 10.5-inch AT3 .300 Blackout barrel, a CMMG Zeroed suppressor tucked under a Stinger Hawk XL handguard, a nickel boron BCG, and a Wtech adjustable gas block. Then he handed Josh supersonic ammo first, on purpose, as a setup. The payoff is the most useful part of the test. Josh shot Hornady 110-grain V-Max thinking it was subsonic, shrugged, and then got handed 190-grain subs. His reaction on camera — \"I love that. That is so much fun. I'm going to need some more of those subs\" — is the whole case for the cartridge in about eight seconds. Key Takeaways .300 Blackout costs roughly double 5.56 per round, which makes it a poor training caliber for high-volume practice. CJ's build: 10.5-inch AT3 .300 BLK barrel, nickel boron BCG, Wtech adjustable gas block, CMMG Zeroed suppressor, Stinger Hawk XL handguard. Josh was secretly handed Hornady 110-grain V-Max supersonics first —…