Follow the link below, and scroll down- there are 2 exploded diagrams for Model 42s. gunpartscorp has some illustrations. Not all that many parts to one.
Egunparts has some.
You can find it on e-gunparts.com
From what I can find out it was made by Mossberg and is the same as the Mossberg model 20 and 21.
Your rifle was made for Western Auto Hardware by Mossberg- it is a Mossberg Model 320. The link below is to a schematic for a similar rifle. Parts MAY be available from Havlin Sales thru their website. EDIT- system will not allow me to add this as a link- Go to gunparts corp dot com, search for Mossberg 320. There is an exploded parts drawing.
The Western Auto model 117 was made by Mossberg which marketed the gun as the model 402. The 402 was produced from 1961 to 1969. The 402 is a carbine (shorter) version of the Mossberg 400 model. It is a lever action .22 cal rifle. The Mossberg manual may be easier to find than the Western Auto. You can find a schematic drawing and parts break down in "The Gun Parts Corp" catalog. See the link.
Your rifle was made for Montgomery Ward stores by Mossberg, and is a Mossberg 346K. You can check with a gunsmith, or check the website for gunpartscorp (look under Mossberg). Havlinsales also stocks many Mossberg parts.
You might find a magazine for one at egunparts.
Need more information. I can find no reference to a Mossberg Model "410" rifle. Is it perhaps a .410 bore shotgun? Please describe your firearm more fully.
Go to Numrich Gun Parts Corp.they should have what you seek.
Well, there is a problem. Your rifle is likely a Mossberg 45A made for Wards. These were made so long ago that makers did not furnish schematics. They expected a gunsmith to be able to fix a basic rifle without being told what to do. There is a Mossberg site under Epix Damguy Mossberg that has an illustration and parts listing for a Model 45B (very similar). Parts MAY be available from Havlin Sales through their website. These rifles are from 1937-1938, so parts may be scarce.
http://www.e-gunparts.com/productschem.asp?chrMasterModel=0860z788
Try a want ad or a gun show.