I snagged a OCL Polonium from CA the other day, now I'm trying to figure out mounting options.  Im new to the suppressor world and Im having a hard time sorting out all the options.  I would like to be able to use this can on 3 different 5.56 ARs.  I am looking at the Rearden Atlas adapter for the can.

I have a 14.5" with a pinned &welded extended A2 on it.  I am thinking of replacing this with a Rearden DPB that would be pinned and welded.
I have 2 16" that i will will probably get Rearden FHD or R2 or SPB, havent decided yet.

Does all this sound like it will work?  Mainly worried about the DPB and the Atlas working together on the Polonium.

Am is missing anything?  Other suggestions?

Im doing the same with the Polonium K I ordered.

The only thing I found in my research would be the overrun on the longer MD into the can. I have no idea if its an issue with these models/combinations though, so the vets in here would have to chime in.

I know they have the Atlas XL adapter which alleviated the overrun, but it adds length to the can

No experience with Rearden, but I had to use the Plan A “L” here to allow the long Griffin pinned flash hider to fit.

This is a question for @AndrewKing

Following though because I put in for an FDE Polonium yesterday and I’m exploring muzzle device options too.

I went with a DeadAir Key-mo on my Polonium K since I have 2 pinned NOX on 13.7 ARs. I also have a Sandman S and FCD Key-mo mounts on my SBRs. I have no issues other than wanneeding more cans…

There's another thread a little farther down that is relevant to your interests

https://www.ar15.com/forums/Armory/So-is-Plan-B-all-that-Hop-makes-it-out-to-be-/20-551231/