It replaced the smoothbore musket.
Best left to a trained gunsmith
Egunparts.com
You need to ask a gunsmith for assistance.
Needs to be sent to a Browning authorized repair center.
Best left to a trained professional
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.
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.
See a gunsmith
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