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Rock River Arms built the National Match A4 upper for folks who care about where the round actually lands. At the heart of it sits a 20-inch air-gauged heavy match stainless barrel with a 1:8 twist that's been cryogenically treated for consistency shot after shot. That 1:8 rate happily stabilizes everything from lighter 52-grain loads up through the heavier 77-grain match bullets, so you're not boxed into one flavor of ammo. Rounding out the front end is an A2 flash hider on a 1/2-28 thread and a railed gas block sight base ready for your front sight or optic setup.
The Wylde chamber is the quiet hero here. It borrows the tighter freebore of a .223 Remington and pairs it with the leade angle of a 5.56 NATO chamber, which means you get a real accuracy bump without giving up the ability to run military 5.56 ammo safely. It's the chamber competition and precision crowds reach for when they want a semi-auto that shoots tight but still eats whatever's on the shelf. RRA relieves the case body to help extraction and keeps the throat short for better on-paper results.
The front end wears an aluminum National Match free-float handguard measuring 12.5 inches, so the barrel never touches anything that would throw off your groups. It carries M-LOK real estate and modular rail sections so you can mount a bipod, sling hardware, or lights wherever they make sense for you. The forged A4 receiver keeps things familiar and compatible with standard mil-spec lowers.
This is a complete assembly, not a project. It ships with the bolt carrier group and charging handle already installed, so mating it to your lower is about as simple as pushing two pins. For anyone chasing precision out of a 20-inch rifle-length build, this is one of the more proven setups Rock River has put its name on.
Yes. The .223 Wylde chamber was designed specifically to handle both cartridges safely, so you can run military 5.56 NATO or commercial .223 Rem through it without worry. That's the whole appeal of the Wylde chamber, and it's why competition and precision shooters gravitate toward it.
The 1:8 twist is about as versatile as it gets for this cartridge. It stabilizes lighter 52 to 55-grain loads all the way up to heavier 69 and 77-grain match bullets, so you're covered for plinking, varmint work, and precision shooting. Heavier match bullets are where this barrel really shines.
This is a complete upper assembly that includes the bolt carrier group and charging handle. All you need is a mil-spec lower receiver to have a functioning rifle. Since the forged A4 receiver is standard spec, it pins right onto the vast majority of AR-15 lowers.
Rock River's National Match builds are known for tight groups, with the 20-inch heavy match barrels commonly turning in sub-MOA performance when paired with quality match ammo. The air-gauged, cryo-treated stainless barrel and free-float handguard both contribute to that consistency. Real-world use in high-power competition has proven these barrels hold accuracy over thousands of rounds.
| UPC | 842834100125 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR0784 |
| Action | |
| Barrel Finish | Stainless Steel |
| Barrel Length | 20" |
| Caliber/Gauge | .223 Wylde |
| Product Type | Complete |
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