Anyone with a surefire 762 Socom MB?

Unless they’ve recently changed, Surefire 5.56 suppressors will only fit 5.56 muzzle devices.
What makes them not fit? I was thinking it was a different indexing notch but it’s not that unless it’s a different depth. If I can modify the brake to fit the suppressor I will as long as it doesn’t cause alignment issues. I’m going to order a 7.62 can but this would get me by until I could physically posses said tube
 
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