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it is a non threaded barrel see ruger spec sheet ******MODEL NUMBER: 43921 CALIBER: 22 LR Capacity10 Receiver MaterialAluminum Front SightFixed Barrel Length4.40" Grip FramePolymer GripsTarget Laminate FinishDiamond Gray Anodized Width1.50" Rear SightAdjustable *************Barrel StyleNon-Threaded Thread PatternN/A Weight27 oz. Overall Length8.40" Height5.50" Grooves6 Twist1:16" RH Available in CANo Available in MAYes https://www.ruger.com/products/markIV2245Lite/specSheets/43921.html