When I get my new (old) CMP rifle..........I strip it down for a good cleaning and inspection. Bad parts are replaced and I lube it up (while reassembling it).
This might help.......
http://www.biggerhammer.net/manuals/garand/m1.htm
Next, I take it to the range with some known good quality M2 ball ammo with known functioning clips (USGI is preferred) and do some slow and rapid fire. Your ammo and clips are very important when testing a new (old) rifle. Believe me........I have been fooled in the past.
So then.........IF I have a problem (not related to SAFETY)......I'll note it or take immediate action on it.
When I return home...........I remember to look up my "problem."
http://m1-garand-rifle.com/garand-troubleshooting.php
also
http://www.biggerhammer.net/manuals/garand/tm9-1275.htm
Sometimes I need to order parts..........so be it. Hey, the rifle has been sitting for maybe 50+ years. A new set of replacement springs might just be an easy fix.