I have done that mod, definite groups tighter, I shimmed the receiver fit at the same time so can't say which was more effective.
IIRC this topic is covered in the stickys sectiion
I pulled the 'u'-shaped sleeve off the front and fastened the liner with s/s machine screws fit in to each side of the forearm - 1 each side about 2" back. to 'bed' to the block I roughed the surface where the 'u' fit and layered hi-temp epoxy to fit the gas block. use pleny of release agent and go slow rather than try to make just 1 heavy apllication. I finished buy useing a fine rasp to round the edges a bit.
I don't have fotos but IIRC 'cajungeo' had a sticky of doing this.
his is one more fine shooting M30.
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