Guess I'm the only one who hates the size and weight of a 7.62mm on a 5.56mm SBR. The M42000 I have on my MK18 is big enough. I couldn't imagine anymore weight or size on the front.
Suppression while not a great with a 7.62, will not be noticeable to the human ear. However it was a no-go for me. I buy cans to match the caliber, for proper balance and max suppression. YMMV

