Rosco Manufacturing Purebred .223 Wylde AR-15 Barrel Medium Weight Rifle - 18"

Manufactured by Rosco Manufacturing
SKU: PB-18-MED-223W-7-R
MPN: PB-18-MED-223W-7-R
Manufactured by Rosco Manufacturing
2 Reviews

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The Purebred barrel series is the result of everything that Rosco Manufacturing has learned about producing barrels. Designed and built from scratch, each Purebred barrel starts as a blank made in-house from 416R stainless steel, before going through their entire manufacturing process. From stepped crown to barrel extension, the Purebred-series is meticulously cut and finished to offer out-of-the-box results that any shooter can appreciate.

  • 18" Medium contour
  • Rifle length gas system
  • 1/2x28 threading with stepped crown
  • 1:7 twist for heavier and longer rounds
  • 416R Stainless steel
  • 80-grit bead blasted finish
  • Slick Nickel Boron barrel extension
  • Compatible with standard .750" gas blocks
  • .223 Wylde chamber for 5.56 NATO and .223 Rem

High quality 416R stainless steel barrel blanks are produced in house and are the starting point for every Purebred AR-15 barrel. Each barrel is meticulously turned and polished, before being mated to their house-built barrel extensions, ensuring they have full control over the entire manufacturing in order to make sure each barrel meets their stringent quality standards. Whether you're building a DMR, a National Match winner, or simply wanting to stretch your AR-15's legs, the consistent performance of a Purebred barrel is just what you're looking for. For even better results, match it with a Purebred-series upper receiver!

This 18" barrel is machined to a balanced medium contour, offering a solid balance between rigidity and weight. The .223 Wylde chamber offers enhanced performance for 5.56 NATO and .223 Remington ammunition, with a 1:7 twist rate that is ideal for heavier, precision-oriented cartridges but is thoroughly functional with popular lighter rounds.

Rosco Manufacturing got their start producing high quality, hard-use precision rifle barrels. They have since expanded, offering their own line of serious use parts and accessories so you can assemble a rifle that doesn't just shoot good and look good, but will handle hard use as well. To top it off, they're production facility is in Central Falls, Rhode Island so you know that every component is 100% made in America, by Americans.
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Barrel CoatingStainless Steel
Barrel ContourMedium
Barrel Length18
Barrel LiningStainless Steel
Barrel Material416R Stainless Steel
BrandRosco Manufacturing
Caliber Gauge.223 Wylde
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthRifle
Thread Pattern1/2 X 28
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

2 reviews

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worth every penny

by -

Picked this up for me 18" upper build and all I can say is I love this barrel. The fit and finish is really nice. I need to take it out to some distance to see what it will really do. But so far I'm liking the set up.



This is my second Rosco barrel. The first was a 14.5” bloodline and it performed well. This 18” is even better. 1/2moa at 100yds with Mk262 analogs, 2moa with cheap 55gr FMJ reloads. And all to the same POI. It’s a thinner profile than the SPR or Mk12 profiles everyone makes. That’s exactly what I wanted; the velocity boost of an 18” barrel without adding a lot of weight. I used a standard milspec BCG, Aero gas tube, and some unmarked gas block I had in a parts bin. Cycled perfectly; ejection is strong enough, but milder than carbine- or mid-length gas systems, locked back on empty without any tweaking. Recoil is very mild, even for 5.56 recoil standards.