As mentioned, you have to let it cure completely before really putting it to too much use. I have done around ten guns with DuraCoat, and you simply cannot put them straight to use. However, its all irrelevant if you don't do the proper prep work before applying the finish.
I try and let mine sit at least three weeks on moving parts. Be aware, though, that the finish can be too thick for tight tolerances, and will affect parts fitting together. I did a Remington 788 several months ago and the results were very good. The bolt has not started showing any wear with repeated cycling, and looks to be holding up pretty well.