Grain generally refers to weight- of bullets and gunpowder. The Mossberg 45B was a caliber .22 Long Rifle firearm. .22 LR is tpically a 40 grain bullet weight cartridge.
1950-64 depending on which variant
Custom proposition only
Mossberg & Sons, Inc. manufactures the Maverick Model 88 shotgun. It is a budget-friendly alternative to the Mossberg 500 series, sharing many of the same parts and features.
You might find a magazine for one at egunparts.
You have the rare version of the model 26,as it has the mannlicher-style stock.The Mossberg model B26M(M is for Mannlicher style stock) was made in the year 1938 only.
A history of Mossberg has been written and is available on Amazon
try egunparts
Maybe a collector will have some information.
Anything made by any other maker that has similar features.
check at: mossberg.com <><><> Mossberg should be able to narrow the date down- that model was made from 1980-85.
The value of a Mossberg and Sons Inc. model 3951 can vary based on its condition, age, and market demand, but it typically ranges from $200 to $500. Factors such as the presence of original packaging, any modifications, and local market conditions can also influence its price. For an accurate appraisal, it's advisable to consult a firearms expert or check recent sales of similar models.
Your Mossberg model 45B is chambered in .22 S,L,or LR. caliber.As such it will take a bullet weight from 30gr to 45gr which is loaded in today,s ammo.I shoot the 40gr. Lead soft point bullets through my Browning A-bolt rifle with great accuracy.These are the Remington Thunderbolt ammo.Many a squirrel has fallen victim to this rifle and ammo combination thru the years.