Noticed that the flat side of my A2's flash suppressor doesn't point straight down, it points about 7:30.

If I loosen it until the flat side IS on the bottom, it's loose. Am I missing a washer? Should I use high temperature thread sealer? Teflon tape?

Please help.  

Are you using a crush washer behind it?



If not, procure a crush washer and it'll be easy to time correctly.

Are you using crush or peel washers?

Use a crush washer and only tighten until it is properly timed.

Yes you should have a washer, crush or peel type, it's your choice.

Aquire new crush washer, take your time and time carefully. They do not need to be man hulked tight. Old school ones were simply hand tightened.

As for using loctite or tape. No. Only if you never want to get it off again. Its already going to get super filled with carbon in there, and after time will be like its part of the barrel. You dont want to make that worse.

TECHNICAL REPAIR STANDARD FOR CARBINE, 5.56 MM, M4A1

Standard A2 FH

UPPER RECEIVER AND BARREL ASSEMBLY MAINTENANCE.
Reassembly.
(1) Install compensator (M4A1).
(a) Using barrel protector, secure barrel in vise.
(b) Install new crush washer with beveled side toward receiver
(c) Tighten compensator hand-tight
(d) Using 3/4-inch open-ended wrench, turn compensator at least 90° (1/4 turn).
(e) Using torque wrench and M-16 combination wrench, torque compensator to 35 to 55 ft•lb.
Center slot of compensator must align with front sight post.


TRS on the Mk18 using peel washers for both the Knight QDSS or the Surefire FMBSC you do use either Loctite or Rockset on the threads.  Course to get it off you have to use a heat gun or hair dryer to loosen it up.


CD

Or immerse in water for the Rocksett.