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Barrel-5.09"
Threads-M-16x1 LH

5.09 inch threaded barrel see ******HK 81000350 Semi Automatic Pistol V1 Double Action/Single Action Safety/Decocking Lever on Left .45 ACP *******5.09" Threaded Barrel Metric 13.5x1 Left Hand Thread Pitch O-Ring Barrel Polygonal Bore Profile 12 Round Magazine 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 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 Overall Length 8.64" Overall Height 5.90" Overall Width 1.26" Sight Radius 6.73" Overall Weight 32.8oz (With Magazine) Matte

Hi William and welcome. Metric 13.5x1 Left Hand Thread Pitch. Cheers, stay safe and enjoy!