Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Recommend taking it to a gun shop for appraisal.
Browning Challenger made in 1974. $300-$400.
100-1000 USD depending on specifics.
For what? Accuracy, target shooting or beasts of the forest?
50-300 USd
350-400.
Type into a search engine on the internet.
Blue Book of Gun Values
It sounds like you need repairs done to a pistol. Recommend contacting the Browning Service Dept. at the link below. They will guide you as to the best way to get your gun repaired.
Browning began producing the Buck Mark .22 pistol in the United States in 1985. The Buck Mark was designed as a versatile and reliable .22 caliber handgun, quickly gaining popularity for target shooting and plinking. Its introduction marked Browning's commitment to providing high-quality firearms for enthusiasts.
try: edssportshop.com
Mainly for target practice with aircraft mounted Browning .50 caliber machineguns.
Need to know iif its a revolver or semi-automatic and the caliber.