Does not come with the advertised flat spring. - ODIN Works AR-15 H-FRB Forced Reset Trigger Heavy Buffer

The buffer itself is of good quality, but it did not ship with the advertised proprietary flat spring and instead a standard spring was in its place. It also did not cycle when installed with my FRT. (Which was the whole reason I bought it) I had to switch to a heavier springco red in order for it to cycle properly. It runs fine now but pretty disappointed Odin works falsely advertised the package.