https://www.woodlandarmoryanddefense.com/odin-barrel-by-odin-works-223-wylde-18-dmr-profile-rifle-length-gas-system.html

The 18" ODIN Works Odin Barrel in .223 Wylde DMR Barrel is a button rifled 416R stainless steel barrel for the AR-15. Chambered in .223 Wylde with a tighter chamber throat for improved accuracy while safely functional with higher pressure 5.56 NATO ammunition.

Features:
  • 18" 416R stainless steel
  • DMR contour
  • Chambered in .223 Wylde with a 1:8 twist rate
  • Rifle length gas system
  • 1/2x28 thread pitch
  • Includes tunable gas block
  • Button rifled
  • Hand lapped
  • M4 feed ramps
  • 1 MOA guaranteed
  • Weight:  2.53 lbs
  • Barrel CoatingStainless Steel
    Barrel ContourDMR
    Barrel Length18
    Barrel LiningStainless Steel
    Barrel MaterialStainless Steel
    BrandOdin Works
    Caliber Gauge.223 Wylde
    Feed RampsM4
    Gas Seat Diameter.750
    Gas System LengthRifle
    PlatformAR-15
    Thread Pattern1/2 X 28
    Twist Rate1:8