To adjust the sights so that they are aligned with the spot that the bullet hits.
What is sightin-in a rifle mean?
@5"
The correct size of the bullet that fits the rifle.
Long and Long Rifle.
Do you possibly mean a knife that is attached to the front of a rifle? If so, that is a bayonet.
Do you mean an air Rifle? NO, Not in the United States.
MKM (marksmansip) on M1 rifle.
do you mean attaching the magazine= clip, to a rifle
Angle Eject.
Jacketed Hollow Point
If you mean Robert Frost, one connection would be that his son Carol committed suicide with a rifle.
If you mean .17 HMR and .22 LR, yes.