I have an M-Carbo buffer washer for my S2K and love it.
I also have a non-MCarbo poly buffer washer in my S&W M&P Sport II. I want to get more but I can’t remember where I sourced it. Now a search online has been useless - CDNN, PSA, MidSouth, MidwayUSA, Durkin, Optics Planet, etc.
I axed one of the online chat dudes here on MCarbo if their S2K washer would work in the AR tube and he said “Nein! Nunca!”
I also looked on Scamazon and got no joy.
Any a y’all got any ideas?