In my experience flash suppression relies on length of your barrel and type of ammo used, noise the length of your suppressor. I say this because of two things I noticed at my range sessions...
1- I use only M855 and MK262 MOD1 in a 10.4 barrel with a Surefire Mini (Not AAC mini but similiar). When I use M855 in the 10.4 I get a pretty noticeable flash every 10 rounds or so. When I use the Mini on my friends 16 inch there is a barely visible flash, at night also. With MK262 MOD1 there is a barely visible flash with both the 10.4 and 16 inch even at night.
2- As I understand it the longer the barrel the more time it has to burn the powder, on a 16 inch it has more than enough time to burn powder to minimize flash through a suppressor. On a 10.4 not enough time and flash is created due to the unburnt remnant powder, therefore with M855 I get the flash every so often. MK262 however burns completely and its my go to round.
If I am mistaken please correct me, but that's the way I understand it.
While I do agree with "go big or go home," personally I prefer mini suppressors as the trade off is worth it (too me). I'm tailored for CQB and I always wear earpro, if noise is your primary concern then a mini isn't for you. However I will say my next rifle will be for long range and I plan to get a AAC 16 inch 300 BLK with the SR7 :D
Also from a tactical standpoint, you'd want to sacrifice noise for size.

