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Hi Alejandro and welcome back. The o-ring is included but, if you need peace of mind, please verify with H&K Customer Service at (706) 701-5554, Hours (M-F 8:30-4:30). Cheers and stay safe!

Hi Alejandro, USP Tactical pistols approach the precision found on the Mark 23 by adding an extended threaded barrel with a rubber O-ring, adjustable trigger, and adjustable target-type sights. . Features & System Characteristics: Threaded O-ring barrel with polygonal bore profile High profile target sights Match grade trigger Adjustable trigger stop Target sights with micrometer adjustment for windage and elevation One piece machined, nitro-carburized steel slide Can be converted to any of nine trigger firing modes Patented HK recoil reduction system Corrosion resistant "Hostile Environment" blued finish Corrosion proof fiber-reinforced polymer frame Oversized trigger guard for use with gloves Choice of flat and extended floorplate magazines Universal mounting grooves for installing accessories Ambidextrous magazine release lever Extended slide release Extractor doubles as a loaded chamber indicator Patented Lock-Out Safety device . Stay safe & have a great day!