While you may have invested a lot of hard earned money into your shotguns, it will all be for not unless you properly store and maintain them. Always use good quality solvents and lubes on your shotguns and protect them in your home with a good quality gun safe or cabinet.

Shotgun Gunsmithing

 The first point I want to make here is, if you like to tinker with your shotguns and do things yourself to save money, just be mindful of; if you ever have to sell your shotguns, appearance is everything. There is nothing worse than messed up or worse stripped screws in a shotgun and for certain will depreciate the value.

 The second point I would like to make is this. If you have to drive pins out of your shotgun there are special punches and or drifts that need to be used to keep from marring your shotguns finish, again mark up the finish and this will take away from your shotguns value.

 The third point I would like to stress here is that a shotguns barrel on the interior portion near the choke will plastic foul badly with just one day of good shooting and will absolutely destroy any hopes of having a good pattern. Bore polishing or burnishing will help dramatically at preventing this.

 Below are some very good references to shotgun gunsmithing.

Gunsmithing Shotguns
by Patrick Sweeney
Paperback
List Price $24.95
"Buy Now and Save"
 This book offers detailed step-by-step instructions for those who want to repair or upgrade their own shotguns. This book tells you exactly how to repair common ailments such as broken stocks or chipped butt plates and more.
 This book also tells you when to call a professional for help and what questions to ask before a professional gunsmith starts working on your shotgun. This is a valuable reference that will save you time and money on shotgun repairs.
-Chapters on all styles of shotgun: pumps, self-loaders and double-barrels.
-Step-by-step instructions with photos.

Assembly/Disassembly
by J. B. Wood
Paperback
List Price $19.95
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 If you own a shotgun, you should have this book. The Gun Digest Book of Firearms Assembly/Disassembly: Part V: Shotguns starts with field stripping basics, thoroughly explains all takedown components, and finishes with reassembly instructions for hundreds of popular shotguns.

Shotgun Care & Maintenance
by Tom Morrow
Paperback
List Price $16.95
 The Orvis Guide to Shotgun Care & Maintenance is the first handbook written expressly for the shotgun enthusiast on maintaining and caring for your shotgun. Chapters include, "Handling & Caring for Firearms Safely," "Bore Obstructions," "Working With Solvents & Lubricants," "Your Gun Storage," "Gun Screw" and more. The Orvis Guide to Shotgun Care & Maintenance provides the most precise and complete information found anywhere on how to correctly, effectively, and safely care for a shotgun. Written by professional gunsmith and master stockmaker Tom Morrow, who has practiced his trade for 30 years.

Shotgun Gunsmithing
by Ralph T. Walker
Paperback
List Price $17.95
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 The Gun Digest Book of Shotgun Gunsmithing takes you to the next level of understanding shotguns from buttplate to muzzle. Features many how to articles on tightening shot patterns, better shooting, and general gunsmithing for the shotgun.