The difference between a loose gas cylinder and a peened one on accuracy.

[browningautorifle]

keeps loosening up.

I'd suggest it's just not being tightened enough...

[WarPig1976]

Just smear a bit of the garand grease in the last two / three threads of the screw ( threads furtherest forward when shooting ) . That should keep her in place . If you do more threads , you'll cuss like a Marine getting her apart.
Chris

I'll give that a try, thanks

You could be right Jim, the slot is all buggered up "not from me" I'll try something with better leverage then the M10.

[TDH]

I ran into that stringing problem with my M1A and the culprit was a loose gas plug. Now I check it as well as the M1's every couple times to the range.

[WarPig1976]

Just smear a bit of the garand grease in the last two / three threads of the screw ( threads furtherest forward when shooting ) . That should keep her in place . If you do more threads , you'll cuss like a Marine getting her apart.
Chris

A combination of grease and using an old S shaped screwdriver did the trick. Shot a WW2 3 gun match this morning and it's still tight...

[Claven2]

Replacement cylinder screws are cheap, if it's bunged-up, just replace it.

[WarPig1976]

Replacement cylinder screws are cheap, if it's bunged-up, just replace it.

I hear ya I will, it's one of those things I forget about til I use the rifle. Another item on the mental shopping list....