- You cannot add "Unchambered 6mm/243 Caliber, Rem 700 Threading, Remington M40A1 Contour, 24", CM" to the cart because the product is out of stock.
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McGowen Precision Barrels Turbo Brake (installation not included with separately purchased Brake). Muzzle Brake will add approximately 2" to the length of your barrel. Threads are dependent upon caliber. More information can be found here.