If one more click is too tight and one less is too loose then the more teeth you have will give you a better fit. The more teeth the finer adjustment you will have. If it fits good with 51T then there will be no advantage to have 90T. IMO
AAC recommends Rockset.
Loctite can't handle the heat.
Tapatalk sent it.
RTFM!!!
Thanks for the info! I have a Schuster nut on the way. Didn't know about the rollers for the HK though. If I gotta switch out rollers between suppressed and unsuppressed maybe it's not worth the trouble for that rifle. That's a great price on the YHM can, but I'm kinda committed already. I told a dealer one of those cans was sold when it came in, and I don't like to jerk people around when I say something like that. I will keep you in mind for my next can though.MK-46 w/ AAC 249-SD Full Auto Baffle Strike - YouTube
Also on the M1A be sure to get a Schuster nut so you dont beat your gun up along with the different rollers for the hk variant
Picked my new AAC 762SDN6 up on Friday, I'm shooting it tmrw for first time(albeit on a 5.56, not a 7.62).