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Derrick, "Last Round Hold Open" is designed standard on this pistol. The Fx-9 Nickle boron complete bolt group is machined out of 4140 chromoly , heat treated to 40 hrc and coated in nickle boron nitride.

yes it has a nickel boron bolt carrier group and last round hold open "All steel components are fully nitrided and/or nickel boron nitrided—including the barrel, bolt, ejector, feed ramp and extractor—for extended wear and corrosion resistance" Key Specifications •Item Number: 708236 •Caliber: 9mm •Action: Semi-automatic/direct impingement •Capacity: 33+1 •Barrel Length: 7.5" plus 3" muzzle enhancer •Barrel Material: 4150 chrome-moly •Barrel Thread: 1/2x28 TPI •Stock: KAK stabilizing brace •Upper Receiver: Billet aluminum with Type III hardcoat anodization •Lower Receiver: Billet aluminum with Type III hardcoat anodization •Pistol Grip: A2 •Handguard: 7.375" M-Lok free-float •Overall Length: 23.5" •Overall Weight: 6.1 lbs. •Mfg. Number: CLAGFX9P •UPC: 856169007028

Derrick, yes Sir. Steel components are fully nitrided and/or nickel boron nitrided for extended wear and corrosion resistance 8.25" barrel is 1/2x28 threaded for muzzle accessories, and comes with a 3" muzzle enhancer.