Try this for a reasonable approximation of a gen 1 NV scope.
Buy a pair of cheap (preferably green-tinted) sunglasses, the cheapest you can find as you're actually looking for poor image quality. Now smear a lot of greasy fingerprints on both inside & outside surfaces.
Imagine that view filmed on a poor video camera for pixellation & you're there.
Not that they don't work, they do, but there is a real low quality to the image & it is monochrome green.
In moonlight or with a bit of city lights backscatter they are adequate but if you are working without a moon, or under heavy tree cover you'll need Infrared illumination to make them usable. When you do this the range of the IR light becomes the range of the Night sight as well.
Gen 1 has a problem with bright light sources, sometimes, depending on brightness a permanent one. It also allows for "trailing" where a bright light (house porch light in the distance for example) will create a trail of light like a snail trail, if it comes into the field of view. Gen 1+ partially solved the problem. Now imagine muzzle flash doing the same thing at the bottom of the field as you fire.
I went with a gen 2 (image intensifier, instead of Ir-viewer) & the difference is major. I now keep my best Gen-1 for viewing only, & use exclusively a gen 2 as a rifle sight. It works out to about 200 yds, but then image quality suffers enough that it becomes useless as you can't positively ID the target.
Size & weight are still an issue though as it weighs 4 Lbs & is large. The bottom 2" long dustcover for a FAL to give you an idea of size. this is strictly a fixed position setup, preferably with a bipod, but within those limitations it works fine & no external light is needed. Using the old set as a worn viewer & the new one as a sight cures the other problem with NV. Once you stop looking through the brightly-lit scope you have zero night vision at all.
Mounts vary but you do need something substantial to support the weight & bulk. Regular ol' scope mounts won't make the grade. This one uses something called STANAG & 2 6mm bolts with a mortice & tenon fitting, a bolt-on standard NATO configuration. Then there is a STANAG adapter to the individual rifle in use ( the lower black part in this picture.)