MSR Uppers are now available from Savage Arms. The Savage MSR Uppers will fit any mil-spec lower and/or Savages MSR15 Lower receiver. They come with the complete bolt carrier group and charging handle. They do not come with magazines. Muzzlebrakes/flash hider are removeable. - 18 barrel with 5R rifling and Melonite QPQ finish - Chambered in .224 Valkyrie - Complete with bolt carrier group and charging handle - Adjustable gas block - Mid-length gas system - Free-float MLOK handguard - Savage Tunable Muzzlebrake - Barrel length: 18 - Twist Rate: 1:7 - Overall length: 27.63