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Part 43/49 are a 'must'. They're the loading nozzles rails and the stock ones are highly prone to breakage due to the material.
An NPAS is a given.
I would look into replacing everything hopup/barrel related.
The rotating plate on the bolt could be replaced to steel, i've been noticing mine has been 'deforming' to an extent.
Plate aside, everything else is basically a must.
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