You would need to be at a minimum distance of 200 yards using soft nose lead only.
No it is not AR500 but it is similar grade.
Yes, they should be able to handle it just fine.
Do All Outdoors states it is a 3/8" thick steel but do not specify what type of steel, please contact them directly for further assistance.
The Stop Light, MPN: RR913 is not AR500 steel and is only rated for .22 rimfire cartridges.
The high caliber popper is spring assisted so it will spring back to ready.
This is 15.6" tall.
It depends on the model, some are manual reset and some are spring loaded. Please contact us at techsales@opticsplanet.com with the exact model you are interested in and we will assist you.
Under additional features it lists some rating information. The first and third option are specifically for .22. The model listed as "Handgun Silhouette Popper" is for pistols 9mm-.45. The models listed as "High Caliber" are for 9mm all the way up to 30-06.