OK genius, show me where he stated either rifle will have a compensator or brake on it.
Last I saw, CMP M1 is stock unadorned bare muzzle. M1A comes with basic mil spec flash "hider".
Is he sure? It’s very easy to confuse the two and there are many products that attempt to do both with various degrees of success. The two terms are frequently confused and or used (i.e. clip and magazine) even by knowledgeable shooters.
The only way to be sure is measure the db level and choose hearing protection accordingly.
Correct. I used to have a 30-06 field gun with a muzzle brake. Unbelievable how loud it was. I'd have guys from other shooting lanes come over just to make sure I wasn't shooting a 50 BMG, or some such.