Can a worn Gas Cyl cause failure to feed?

[tranniedoc]

Hi, I'm new here, thanks to this great site for the info I've already learned. I have a Winchester Garand (mix master) that is experiencing Failure to Feed on almost every round. I'm using some vintage M2 Ball ammo. I checked the op rod piston (it's .525"O.D.). I checked the gas cylinder and it's oblonged at the rear (.527" I.D. side to side, .550" I.D. top to bottom).
I can see a wear pattern on the floor of the cylinder that goes in about 1" from the rear. Is this what's causing my FTF? (the pressure escaping before the bolt is pushed back far enough to let the next round move up into position). Is there something else that I should be checking? What would cause this wear pattern? The op rod piston is clean, no marks.
Thanks.

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