M1 Garand Gas Cylinder Issues

[Sonny.Frechette]

I picked up a M1 grand for somewhat cheap a while back and have been having feeding issues with it. In my research I came across the specs for the inside diameter for the gas cylinder and using a small bore gauge, I determined it to be out of tolerance. Also along the bottom of roughly the last 1.5" of cylinder appears to be wore down considerably, roughly .025" more than the front. I ordered another cylinder from marstar being told they were still within GI spec. When I received it I noticed the same seemingly worn dark cylinder bottom on the marstar replacement. The rest of the cylinder all seems to be exactly 0.528" inside diameter. I attached a picture showing the dark spot being .025" wider at the back of the cylinder. Being new to Garands I thought maybe somebody could enlighten me on if this is wear from use and if I should send back for another one, or if this normal from production. Any input on what I should be looking for on the gas cylinder would be greatly appreciated. Also is the mild pitting inside the cylinder an issue?


http://s1262.photobucket.com/user/sonnyfrechette/library/

 

[Lornescot]

There's a lot of things that could cause feed problems aside from gas cyclinder from parts not being lubricated to the en blocs. Are you sure it is gas cyclinder? Did it fail to feed constantly, a lot, or occasionally? What kind of ammo were you using? Garand specific ammo? I like to work backwards and eliminate all other possibilities before swapping out parts. Learned my lesson spending cash on parts I didn't need

 

[Airbob10]

The cylinder should be at .528. I bought a set of 3 gauges to test all of mine. What are your symptoms? There are many reasons for feeding issues. Is the gun not cycling?
There are a lot of knowledgeable Garand owners on this site that could help you. Let us know before you spend a lot of money. It could be anything from your op rod ($250) to your clip latch spring ($5).

 

[purple]

Forget about gauges for a bit. Does the rifle cycle properly? There are a number of causes for short stroking/insufficient gas capture in the cylinder, of which an excessively worn cylinder is only one.

 

[Pblatzz]

Here's you picture

 

[musketjon]

The "worn" spot on the back side of the GC is for venting the gas. It's not worn--they're made that way.
As to the rifle not cycling, can you be a bit more precise? What you've said is akin to taking your car to the mechanic and saying it doesn't work. What's wrong. It could be an undersize op rod piston, clogged gas hole, loose gas cylinder lock screw, weak, or broken op rod spring, under powered ammo, un-lubed internals, the list goes on. We need specifics to help you solve the problem.
Jon