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Alpha Shooting Sports can machine your Glock barrel with our highly effective Alpha Barrel Porting to help mitigate muzzle rise and felt recoil. Sort By: Price: Low to High Price: High to Low Most Popular Title Manufacturer Newest Oldest Availability 30 per page 60 per page 120 per page 180 per page 300 per page Page of 1 Alpha Porting for Glock G19 Barrels List Price: $89.99 MSRP: $79.99 Savings: $10.00 Alpha Porting for Glock G17 Barrels List Price: $89.99 MSRP: $79.99 Savings: $10.00 Alpha Porting for Glock G34 & G17L Barrels List Price: $89.99 MSRP: $89.99