This Mossberg manufactured 24" barrel in 22 S, L, & LR caliber is for the model 42B bolt action rimfire rifle and is the late variation with a single drilled and tapped hole for mounting the ramp front sight. The barrel is in very good condition exhibiting a mixture of thinning original blue finish with a brown patina. All printing is clear and legible.  This late variation barrel has a single drilled & tapped hole for installing the front sight instead of a davetail which is seen on early variation 42B barrels.  (file photos)