Interestingly, the M14 is only now finally getting entirely phased out. It found quite the niche doing exactly what it was designed for, middle to long range precision fire.

Entirely tangential, but I really don't think John Browning gets enough credit for how good his designs we're.

The M2 is still in regular use, and the M1911 keeps popping up despite the pentagon's best attempts to phase it out. An argument against design by committee.