Difference between old and new Ronin

Ask Donny, he has alwsys got back to me very fast. Besides you'll get factual information.

I have an email in to them. I just didn’t know if I could pick someone’s brain here first. I just ordered an endcap from Utah air, and now I’m worried it won’t work. I was hoping to get the info ASAP, so I can plan accordingly with my order. 
 
I believe the earlier version use a different end cap. The easiest way to identify the old and the newer version is just look the the muzzle end of the moderator. Here is the picture of the muzzle end of an earlier version. Smooth finish end.

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and here is a picture of the newer version (current version). 

DFEFB91A-61F1-41C1-B09B-01EAC7BAE5D3.1637526523.gif