Depends on the rifle. some have 10, some 50 or more.
webdept@gunpartscorp.com has many parts and breakdown books for many Stevens rifles and shotguns.
It depends on the set up of the rifle but a typical A2 style with collapsing stock has about 106 parts.
Unfortunately your Model 10 Mossberg (one word) rifle was only made from 1934-1936, with the end result that parts will be VERY hard to find. Gunpartscorp has only a few parts for these on their website. havlinsales has many Mossberg .22 parts (and run the Mossberg Collector's Society) Finally, a good gunsmith can make many of the small parts that you rifle may need- but finding parts WILL be difficult. Good luck-
You can check with Numrich on their website as gunpartscorp, but this rifle has been out of production for many years, and parts are NT commonly available- sorry.
Contact Crosman (Customer service.) The Rifle was made between 1999-2001. Some parts are still avalable. (see the link below)"Some parts are available" according to Crosman customer service section of their web site. "Bryan and associates" has many obsolete parts.
You will have to specify if you mean for a total breakdown, field stripping, cleaning, etc..
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.
The Testament of Gideon Mack has 389 pages.
The largest parts store I know of is e-gunpart.com. Brownell's also stocks many parts as does Midway.
See related links I put a pointer to e-gunparts.com for the model 16, the have many schematics there as well as the parts page online.
How many hours does it take to take out and replace a transmission on a commercial tractor as a Mack? And what would be the average price?