Made four m4/m16 type flash hiders with 14mm negative threads. The first two flash hiders are the common bird cage design, the third is closed with no holes in the sides, and the fourth is the three prong type. Print with standard 0.2, no supports are needed. Updated files with better threading so they will be easier to thread on to the end of the barrel.
Update: Spent the week working on the threads. Had some complaints about the tight threads so I am releasing new versions that have looser threads.