Quoted:
How do you "time" these 74 style brakes?
For a rifle with a 24mm muzzle thread, you thread the brake (righty tighty, lefty loosey
) onto the muzzle until it stops, then back it up to where the detent pin locks the brake in place. Just like a slant brake on a 14mm muzzle.
For a rifle with a 14mm muzzle thread, you must first thread on a 14mm-to-24mm thread adapter (lefty tighty, righty loosey aka "reverse" or left-hand thread), then follow the steps for installing on a 24mm threaded muzzle.
FYI: It can be a PITA to remove a 24mm brake from a rifle using a 14mm threaded muzzle. The detent pin will be WAY down in the brake's detent notch, requiring a scribe or other small metal probe to move the detent to the rear for brake removal. This is the case, even though the 24mm brake has a triangular-shaped cut at the front of its detent notch which is supposed to eliminate this problem. It works well, but only with the higher position of the detent pin on the 24mm front sight base, AND the larger diameter of the "24mm style" detent pin.