Ruger Mark IV 22/45 Collector's Series .22 LR 10+1 5.5" Blued Threaded Bull Barrel, Blued Ally Steel Receiver, Blued Polymer Frame w/Engraved American Walnut Grip Collector's Series Mark IV 22/45 models feature oak leaf and basket weave pattern engraved American walnut grip panels and include two magazines, a 2025 Collector's Series metal license plate, decal and lapel pin.