I'm sure someone has a particular method and a reason for recommending it, but I simply field strip and thoroughly clean a new gun like that, make sure it's lubricated and run a couple of hundred rounds through it, using all the magazines I have for it for at least a few rounds if unable to load each to the maximum to ensure feeding, ejection, site regulation and to see if everything is tight, staked, and screwed on properly from the factory.
If it does what it's supposed to with no bobbles I consider it "broken in" after about 500 rounds total. All semi autos must be properly adjusted and maintained to operate trouble free, but if any inherent problems exist they'll most likely show up in the first 500 rounds if at all. At least that's my 'rule of thumb', and there are always exceptions to every rule, so . . . .
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