Coarse file will do it quick. If someone you know has a disk sander it'll take about 1sec. Mark a line of where you want it to be before hand...an exacto blade works.
Either aluminum black or cold blue will work...wipe on, let it do it's thing...rinse to stop the salts from acting further. It will wear off with use though...so you might want to hit it with clear lacquer afterwards, or just touch it up again. It'll naturally oxidize a pencil grey.
Or find/swap in a 4.3 mag release...same fit, lower profile. Guys that mod their pistols with shiney stainless parts might have one off a stock gun.
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