Hole opening to match caliber

If Terminator Muzzle needs machining to open up through hole to meet your specific caliber.
Per Muzzle device
 
In your cart please add a note that shares with GGW your desired finish hole size.  Please follow the guide on each product.  The larger the caliber, the larger the overage is required.  All expanding is done in 1/64" increments.  
All magnum sizes, the hole is opened up to assume magnum use.  
Example 30 caliber is opened up for 300 win mag.