You also want to look at it from a long game perspective.
If/when you buy a 30cal suppressor.
DI is quietest, spits in your eye from the charge handle, no matter what
Short Stroke, very loud
long stroke, marginally quieter, still loud. (Suppressed AK's rape your eyes right where the guide rods locks into top cover, with gas and debris)
roller lock, decently quiet when you actually do the math from roller lockup and low angle lock piece.
Direct Impingement, and Roller delayed blowback are your best bet. RDB spits less shit in your eyes, because there's no cutout near your face for gas/debris to strike you.
If/when you buy a 30cal suppressor.
DI is quietest, spits in your eye from the charge handle, no matter what
Short Stroke, very loud
long stroke, marginally quieter, still loud. (Suppressed AK's rape your eyes right where the guide rods locks into top cover, with gas and debris)
roller lock, decently quiet when you actually do the math from roller lockup and low angle lock piece.
Direct Impingement, and Roller delayed blowback are your best bet. RDB spits less shit in your eyes, because there's no cutout near your face for gas/debris to strike you.