Introduced in 1952
worth on Mossberg and sons model 146 b-a with m4d scope 22 cal.
The Mossberg M4D is a variant of the M4 shotgun produced by Mossberg. The specific manufacturing date can vary based on the production batch, but Mossberg began producing the M4 series around 2001. For an exact manufacturing date, it's best to refer to the firearm's serial number or consult Mossberg directly.
Elevation will be the one that moves it up and down. Windage will be the one that moves it from side to side.