Fits Sig Sauer P365 pistols as a direct drop-in replacement for the factory barrel. Not compatible with P365 XL or P365 Macro - those models use a different barrel length and lockup. True Precision machines these barrels in Georgia from USA-sourced certified steel and finishes them in a hard black DLC for wear and corrosion resistance. The broach-cut rifling is designed to boost accuracy potential over the factory barrel, and the barrel is rated for both standard pressure and +P 9mm. Barrel specs: 9mm, 1:10 twist, broach-cut rifling Black DLC (Diamond-Like Carbon) finish 1/2x28 threaded muzzle with knurled thread protector installed +P rated for defensive loads Designed and manufactured in the USA MPN: TP-P365B-XTBC Use notes: Works with standard P365 slides (OEM and aftermarket cuts matching factory length) Thread protector removes for direct-thread compensators or suppressors Confirm headspace and function with a few rounds before carry use Clean the chamber and bore before first use, run lubed for the first 100 rounds, and verify lockup and ejection with your preferred defensive load before trusting it for carry.