For anyone considering purchasing an M1 Garand rifle
The CMP Sales Program is without a doubt the best route to take in purchasing a M1 Garand rifle. However, I suggest the decision be made quickly as the stock of existing rifles is diminishing, check out the link.
When you buy a M1 Garand from the CMP and take it to the range there can always be a problem, things can go wrong. When you do an about face on the range with a problematic rifle the people standing behind you and your rifle are the same people who sold it to you.
Give this link a read as it is a great story that clearly shows CMP support.
That said and away from the CMP there are any number of problems that can exist with a M1 Garand rifle. Take a good look at the IPB (Illustrated Parts Breakdown) or an actual disassembled rifle up close and personal. No shortage of moving parts in there and any one of which can cause you problems.
The Bullet Test
The bullet test as seen in a variation above is not really a definitive test for ME (Muzzle Erosion) as it really depends on the true bullet diameter. It will afford a rough idea and that is as good as it gets.
Other parts like the barrel TE (Throat Erosion) are important also as well as a long list of other measurement parameters. Any one of which can cause reduced accuracy or malfunction of the rifle.
While there is nothing wrong with buying a M1 Garand from a LGS, pawn shop or seller at a gun show the buyer needs to know what to look for and the list is long. Will the seller be there for you if there is a problem? Will the LGS put in writing they will refund your money if there is a problem? Replacing an operating rod with a worn piston or bend is an expensive proposition as is replacing an out of specification gas tube.
Many times I have seen the less than savvy M1 Garand buyer field strip their new rifle to find rust and pitting below the wood lines. Loose rear sights or worn rear sights are another problem as well as gas system issues and worn parts in the trigger group. A Google of "M1 Garand Buyers Guide" will provide a wealth of information on things to look for before buying. Be wary and walk away from any seller who won't let you field strip the rifle or field strip it for you.
Just Some Thoughts....
Ron