Need more information - Streamlight Tactical Flashlight Mag Tube Rail Mount

I was unable to find out from the description whether the adapter would fit on my Beneli M4. Unfortunately it does not. I was able to find an adapter that did fit but had to go to another store. The correct inside diameter is 26mm, NOT 1".
Pros: Good quality, nice finish
Cons: Doesn't fit my shotgun tube

This review was written in the old system and had content requirements that are different than reviews written today.