When writing a review on a firearm, some ammo, or an optical sight, etc., it is probably not a good idea to say that you had “zero issues” or “zero problems” or “zero failures” with it. I’m going to be left wondering exactly what these specific zero issues/problems/failures were, and why you’re not telling us more about them. If you had “no issues” then it would be best if you put it just like that. “Zero issues”, on the other hand, are a whole different subject, and they are potentially very frustrating.
(for those of you who aren’t part of the gun culture, your “zero” is that particular adjustment, or set of adjustments, of your sighting system that puts your bullet right on target at a specific distance when using a specific load [often under specific atmospheric conditions])