Our list of available chamberings is extensive! Select your choice from the drop-down menu below.

We will match the most ideal rifling twist rate to your cartridge and barrel length selections. For example, a 300 BLK under 8 inches will be built with a 1:5 twist 5R rifled barrel, and a 300 BLK 8 inches or over will be built with a 1:7 twist 5R rifled barrel. If you have a specific twist rate request from X-Caliber’s available options, please type that into the Notes field at the end of checkout.

Additional information


300 Blackout, 6.5 Creedmoor, 308 Winchester, 375 Raptor, 223 Wylde, 224 Valkyrie, 6mm ARC, 6BR, 243 Winchester, 6mm Creedmoor, 6×47 Lapua, 6.5 Grendel, 260 Remington, 6.5×47 Lapua, 6.8 SPC, 7mm-08 Remington, 270 WSM, 300 WSM, 338 Federal, 350 Legend, 358 Winchester, 45 Raptor, 450 Bushmaster


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