Here are several Take Off (T/O) Ruger MKIII 22LR & 22/45 pistol barrels for sale that can be interchanged on any Ruger MKI, MKII, MKIII or 22/45 pistol frame. If you know how to remove and clean your Ruger MKI, II or III then you know how to replace and change your barrel...Its that easy!! Here are the models I have for sale. Ruger MKIII 4.5" Stainless Steel Tapered Barrel with Bolt, Mainspring and Hardcase (Ruger Model 10116 MARK III 22 LR 4.75" Davidson Exclusive) $239 NEW. Ruger MKIII 22/45 Matte Black Tactical 4.5" Baarel THREADED w/tactical rails (Model 10149) $169 NEW. Change up your favorite Ruger pistol and have several guns in "one"! These are all serial numbered!! FTF and must sign bill of sale. I can also ship to an FFL if needed. Must be 21 to purchase.