The issue with a WSSM anything (the BFG) is you have to start with a Oly Arms non standard upper that can handle the pressure.
Dtech builds custom WSSM uppers and he is on the web. They run about 1k.
I had an oly 25 wssm upper and it was heavy and way out of balance for an AR15 but it was a 24" bbl.
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