Norc Shorty M305 - Upgrades to improve accuracy at longer ranges

The M305 that I bought off the EE has a NM flash hider but there is a fair amount of wiggle to it. How do I fix this? Do I buy a castle but wrench or do I do something more drastic. I don't know what "peening" is.

Also, my M305 has a USGI fiberglass stock. Can someone point me in the right direction as to how to bed it? I have bedded 3 bolt guns to date so I understand the process, I just need to know what to do to the stock and what areas to bed.
 
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