This apex 9mm threaded barrel is designed specifically for the fn 509 model pistols with a factory 4.00" barrel.This includes the fn 509 midsize.The heat-treated stainless steel barrel has a black melonite finish with contrasting stainless flutes.The barrel features a 1:10 twist rate that is designed to increase accuracy performance.The thread pattern is 1/2-28 and a thread protector is included.This barrel is a true drop-in and requires no fitting.
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