Well, I mentioned that tidbit reminiscing about how loud it was with the standard Made by Mattel buttstock that came with the issue version I fired for twenty some-odd years in service. With every single shot I fired, especially in a non-hostile environment like at the range, that "Sproing!!!" sound pretty much overcame the pop coming out of the pointy end. But then I pretty much blocked out the sound of the blast and most anything else when firing anyway. IDK, maybe it's the way I cradled the rifle or something unique to my style, but I always qual'd at least 38 out of 40 every time I was dragged out to the range so it wasn't like I was doing something weird or anything. Although what was unique about my style was that I wouldn't actually hold the handguard when firing, but rest the handguard on a clenched fist and either squeeze or relax my grip to get the final elevation sight picture just right the instant before firing. Worked especially well in the prone supported position. 😉
Apologies to OP for going OT.