I've had great success with Krylon's ultra flat black, just remember surface prep is the most important step. If you want a more durable finish with it strip the slide and apply a base layer of automotive primer. The Krylon works great when done this way and seems resist chipping quite a bit better.
Another option that is even more durable and some have used as a firearm coating is Duplicolor engine enamel, specifically DE1634. It has a pretty long curing time but this stuff is really durable. Most stores like Canadian tire have it.
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Durate et vosmet rebus servate secundis.
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