The Challenger II has an all steel frame and the Challenger III has an alloy frame; I don't know what the alloy is.
50 - 400 usd
100-400
A .22lr AS is a little more powerful. It's very similar to the .22 WMR
Your Browning auto rifle in 22LR was made between 1956 and mid 1961.
22LR
15
Browning's web site has a sn search function.
You will have to call Browning or visit their website and look up the sn to find out.
The Browning medalist was the best by far.If you can find one,these were made from 1959-1974.
50-1000 usd
A 22lr semi-automatic pistol.
2-20 usd