Timney Triggers 49'er, Safety Selector, Black Finish, Can Be Used in a 90 Degree Position or 49 Degree Short Throw Position AR 49ER SAFETY The Timney 49er 49 or 90 DEGREE SAFETY (Ambidextrous) can be used in either the normal 90 degree or for ultra quick changes a 49 degree short throw for quick and easy manipulation. In addition" the safety features an end plate allowing the removal of the ambidextrous arm if a one-sided safety is preferred. The 49'r is a true drop-in part that will work with any Mil-Spec lower receiver.