No, it does not have that feature.
Yes, as long as you have the picatinny/weaver style rail on top.
It will not as the mount on top of the Henry AR-7 is a 3/8" dovetail. You will need an adapter to mount this. Please email us at techsales@opticsplanet.com and we can provide an adapter to use this Sightmark.
We would recommend potentially looking at a red dot that is more recommended for that type of application. Something like the Sightmark Ultra Shot would be a better option.
It will not work on a handgun unless the handgun has a picatinny rail mounted on top.
No, it requires either a weaver or picatinny rail for installation.
Yes, it will.
Per Sightmark: "4 Pattern - 5 MOA dot, 3 MOA dot with 50 MOA circle, 3 MOA dot with 50 MOA crosshair, 3 MOA dot with 30 MOA circle/crosshair (subtensions total 50 MOA)"
The battery is installed in a tray on the side of the optic. You can replace it without removing the sight from the firearm.
It will work as long as you have a picatinny rail installed on the pistol.