It means you have a Mossberg Model 500a shotgun with the serial number L109563.
Your westernfield model 767 was made for mongomery wards(westerfield) by mossberg gun manufacturing company.The mossberg model designation for your gun was the mossberg model 800A.
Your westernfield model M822 was made for montgomery wards(westernfield) by mossberg gun manufacturing company.The mossberg model designation for this gun was the mossberg model 640K.these were made by mossberg between the years 1959-1984.
Check with Mossberg Customer Service thru their website.
In general Mossberg firearms are well made and dependable. They are not high $$$ guns, and do not have the collector appeal of other guns, but work well. Mossberg's motto has been "More gun for your money"
My Mossberg maverick holds seven without the tube plug
It was made from 1950 to 1957. If you are interested in the older Mossberg firearms, get a copy of "Mossberg-More Gun for the Money" by Victor Havlin.
There was discussion of plans to issue a Mossberg 500 to commemorate the end of the Long Gun Registry in Canada.
Mossberg. They are in business, and have a website. Try Customer Service.
.410
Normally marked on the barrel.
One can find a clip for a 22 caliber New Haven Mossberg rifle through local gun retailers. These pieces can also be found through gun classifieds and gun manufacturers.