Can you replace pt917 fixed rear sights with adjustable sights?

Weatherby 92 12 gauge pump how much is it worth? How much is your derringer ex cam T38 worth? What is the value of a 22 caliber single action lr Texas scout revolver? Smith Wesson 340 ct? Which of these rounds of ammunition weighs the least - 12 gauge shell - 7.62x51mm NATO - 22 rimfire - 9mm? What is the bore a shotgun barrel made specifically for? What is the Remington? How do you disassemble a harrington and richardson 676 .22 revolver? Where can one go to obtain Gunsmith tools? What is the value of a sterling silver American Walther pocket watch serial number 8083180? What is the guardian angel by Robert browning about? What is the value of a Colt 45 auto model 80 camo companion? How much is a Sears single shot 410 model number 273.510790 worth? What is the value of a 1976 Japanese Browning Auto-5 Light Twelve with 26'' modified and full barrels in good condition with minor blemishes on the stock? How accurate are ruger m22 rifles? 30 Remington model 8? Where is the serial number on a JC Higgins model 583.25 20 ga bolt action shotgun? What is the price of a Used ruger ss 357 vaquero? How do you change combination on 2009 cabelas liberty classic gun safe? Can lead bullets be used in a Beretta CX4 carbine?