PDI Japan's latest Muzzle Brake product which of course is always made for Tokyo Marui products, with this item compatible with the TM M4 Series. Made of duralmin, CNC'd, and is anodized black. This has a tight diameter and when installing this, you cannot extend your inner barrel (and of course destroys the aesthics), so ensure that the inner barrel is the length where the muzzle meets the outer barrel with a 14mm CCW thread. Please do make sure that the the outer barrel should be 17.8mm.

The 556 Muzzle Brake is priced at JPY3,969/US$45, which surely will make your M4 look good at the front end.