The F-45 metal flash hider spring fits all KM4, RM4, LM4, and AKG rifles, and fits under the flash hider washer to keep tension on the washer and flash hider. It appears on respective diagrams as KM4 part 165, LM4 part 208, and AKG part 381.

Weight .01 lbs
Dimensions .75 × .75 × .75 in