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Scorch: That's not going to work on an M1 Rifle.
jmquinn05:
Is the sight loose on the gas cylinder, or is the gas cylinder loose on the barrel?
If the sight is loose on the gas cylinder, use the correct size Allen wrench to tighten the screw at the rear of the sight. If the screw is stripped, replace the sight and screw.
If the gas cylinder is loose on the barrel, a simple, easy, and non-destructive fix is to close the splines on the barrel slightly to tighten the fit of the gas cylinder.
Remove the gas cylinder lock screw, remove the gas cylinder lock, and remove the gas cylinder.
Lay a socket from a socket set on the top barrel spline where the splines on the gas cylinder fit.
Use a plastic screwdriver handle to give the socket a couple of raps.
Put the socket on the second spline and repeat.
Put the socket on the third spline and repeat.
This will slightly close the splines and tighten the fit of the gas cylinder.
This doesn't take much so don't hammer on the socket. The splines will close too much.
Ideally, you should have to put a small block of wood in front of the gas cylinder and gently tap the gas cylinder onto the barrel.
You don't want to have to drive it on, so that's why you should only tap the socket on the splines.
To reassemble the gas system, put the gas cylinder on the barrel, then screw the gas cylinder lock on until it touches the cylinder. Back the lock off until you can get the gas cylinder lock screw in, even if that takes almost a full turn of the lock.
When the screw is tightened, this will pull the gas cylinder and lock together.
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