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Charles, barrel is 4.6" threaded barrel (1/2x28). Cheers and stay safe!

1/2x28 thread pattern on the barrel. I hope this helps!

Comes with a Glock factory 1/2x28 threaded barrel (thread protector included) Barrel is manufactured using a cold-hammer forging method for uniform precision and consistency MOS Modular Optics System for easy mounting of red dot optics Modular Back Strap System for a better hand fit 5.5-lb. trigger pull is nice and clean Enlarged reversible magazine catch allows you to switch the catch to the left or right side of the pistol Dual recoil spring assembly reduces felt recoil and increases durability Rough textured frame enhances grip traction Safe Action® System helps ensure your firearm does not fire unintentionally Gas nitride finish for maximum durability and corrosion resistance Includes (3) 15-rd. magazines and (2) extra modular back straps

1/2x28