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RSR Stock #: ROSPB-105-HB-300BLK-7P
Manufacturer Part #: PB-105-HB-300BLK-7-P

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Rosco Manufacturing, Purebred Heavy Barrel, 300BLK, 10.5", Bead Blasted Finish, 1:7 Twist, 5/8x24, 416R



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  • Barrel Length: 10.5"
  • Barrel Weight: 21.09 oz
  • Barrel Material: 416 R
  • Barrel Caliber: 300 BLK
  • Barrel Profile: Heavy
  • Twist: 1/7
  • Barrel Thread: 5/8 x 24
  • Gas Block Size: .750
  • Gas System Length: Pistol
  • Barrel Crown: Step Crown
  • Barrel Finish: 80 Grit Bead Blast
  • Barrel Extension Finish: Nickel Boron

Product Description

Purebred 10.5" 300 Blackout Barrel: This Rosco Purebred 10.5" 300 Blackout Barrel was designed for SBR/ Pistol use in conjunction with suppressors. The 10.5" Rosco barrel was made to be a direct precision replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5" barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15's, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY! Rosco Manufacturing's Purebred series is a testament to precision and quality manufacturing. Rosco took a step back to see how Rosco could create a barrel line that would be a culmination of all the lessons learned through years of making barrels for several OEM's. The result is a barrel that will produce results out of the box for any shooter that is looking to take their skills above and beyond.