The technology has changed. If you already have one, then go ahead and try using it. Otherwise, go digital instead. If you search this forum, you'll find the subject pretty well covered. The short answer is to buy a Sightmark Photon XT. If you feel lucky and want more features, then consider the ATN X-Sight. With both, you will need a good IR illuminator.
NRA Endowment & DSC Lifer