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Proof Research earned its reputation building barrels that shoot tighter than they have any right to, and this 16-inch stainless steel model carries that same standard into your AR-15 build. It runs a .223 Wylde chamber, which is the sweet spot for folks who want to feed both .223 Remington and 5.56 NATO without giving up accuracy. The 5/8×24 threaded muzzle takes just about any flash hider, brake, or suppressor mount you want to hang on it, so you have plenty of room to set the rifle up your way.
The interesting piece here is Proof's Caliber Matched Gas System. Rather than dropping a gas port in a generic spot, Proof moves the port to match the pressure curve of the cartridge and the length of the barrel. The payoff is real: a recoil impulse that feels noticeably softer, less fouling working its way back into the receiver, more reliable extraction, and less beating on your brass if you reload. It is the kind of tuning most people never think about until they shoot a rifle that has it dialed in right.
This one is cut from match-grade 416R stainless steel with a 1:7 twist and 4-groove rifling. That twist rate stabilizes the heavier bullets a lot of precision and defensive loads use, so you are not locked into light 55-grain stuff to get good groups. Stainless holds up well against corrosion and stands up to the heat and pressure of extended range sessions, which is exactly what you want out of a barrel you plan to shoot hard.
This is a barrel for the person who cares about the details, whether that is a range gun you want to shrink groups with or a working carbine you need to trust. Pair it with a quality bolt carrier group, gas tube, and gas block sized for the intermediate gas length, and you have the makings of a seriously capable upper. Proof gives you the barrel; the rest of the build is where you make it yours.
Yes. The .223 Wylde chamber is designed to safely run both .223 Remington and 5.56 NATO. It gives you the tighter tolerances that help with accuracy while still handling the higher pressures of 5.56, so you get the best of both worlds without compromise.
CAMGAS is Proof's Caliber Matched Gas System, which places the gas port to match the pressure curve of the cartridge and barrel length. The result is a softer recoil impulse, less fouling in the receiver, more reliable extraction, and less wear on your brass. It is a nice bump in how smoothly the rifle runs.
This barrel has a 1:7 twist with 4-groove rifling. That faster twist stabilizes heavier bullets well, so it handles the 62-grain to 77-grain loads that a lot of precision and defensive shooters prefer. It will still run lighter bullets, but the 1:7 really shines with the heavier stuff.
The 5/8×24 threading is a common thread pitch that accepts a wide range of flash hiders, muzzle brakes, and suppressor mounts. Just confirm your specific device is cut for 5/8×24 and you are good to go. It gives you a lot of flexibility for how you finish out the build.
| UPC | 843068143384 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 143384 |
| Shipping Weight | 3.101 |
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