Try a different suppressor, either DPT or ASE Utra.
I have a ASE and it has excellent sound suppression and is only 100mm long.
Failing that just sell the rifle and buy another.
You will never get your money back if you start "customizing" your rifle, you may get lucky and get a good used barrel and stock and maybe break even, but not very likely.
Selling your rifle and buying another used one is usually your best bet.
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