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ARB20-556GS: 5.56x45 SS Fluted Gamestalker Barrel Closeout

Quick Overview

5.56 x 45 Gamestalker barrel closeout

Availability: Available (built to order)



This is the barrel we use for the Gameslaker GSG2 model chambered in 5.56x45. Specs below:


  • Chambering: 5.56x45
  • Material: 416 Stainless Steel
  • Rifling: Button rifled Match-Grade
  • Twist: 1x9"
  • Length: 20"
  • Muzzle: Crowned - noth threaded.
  • Extension: M4 feedramps
  • Gas system: Rifle length
  • Gab Block Diameter: 750" 
  • Fluting: 1/4" End Mill Slow cut 6-groove fluting (removes roughly 1 pound of weight)
  • Finish: Satin stainless finish


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Olympic Arms, Inc. is not affiliated with the IOC/USOC or any other Olympic sports organization.