Aero's fix-it kit gets you the most commonly lost parts to finish your build.All parts in the fix-it kit are compatible with ar15, m4e1 and m5 builds.Kit includes- 4- takedown pin detents, 4- takedown pin springs, 2- bolt catch roll pins, 2- trigger/hammer pins, 2- safety selector springs, 2- safety selector detents, 2- buffer retainers, 2- buffer retainer springs, 2- disconnector springs, 2- 4-40 set screws (for threaded takedown pin detent hole) and a threaded roll pin.Made in the usa.

Model: Fix-It Kit