Re: Info on M1C or D Garand Sniper Rifle
Check out some of Peter R. Senich's books:
The Pictorial History of Snipeing
Limited War Sniping
Long Range War, Sniping in Vietnam
All three have excellant discriptions of the M1C/D sniping systems. All the varients, scopes and mountss.
When I first started running sniper schools for the National Guard we were using M1C/Ds. My armorer used these books to help him with the maintance on the weapons.