Everyones DM4 is different some could have alot of kick at 3 turns out or even 4. You gotta sweet spot the lpr and inline together to get the best result. I only recommended 4 turns out cuz its a lil less than 5 and it is enough at 65 psi to prevent bolt lag which can cause kick and loud bolt action.
GaT- DM7 Cobalt/black dust
ups- Tech T boLT Hyper 3 reg