It replaced the smoothbore musket.
Egunparts.com
Best left to a trained gunsmith
You need to ask a gunsmith for assistance.
Best left to a trained professional
Needs to be sent to a Browning authorized repair center.
Job is best left to a gunsmith
5-20 usd
Daisy offers a free service to tell you more about your Daisy. You can also write to them and see if they have a parts drawing for the rifle (See the links below)
Best left to a gunsmith.
See a gunsmith
The M16 "jungle rifle" replaced the M14 US service rifle on or about 1967; but wasn't fully transitioned into US units world wide until the end of the Vietnam War in 1975.
They're are experimenting on the XM8 assault rifle that's suppose to replace the M4/M16 family because its more reliable, lighter,easier to clean, and easier to train with