I had very bad experience trying to order those 1911 parts from Marstar.
First of all, they never answer your email.
Second, when I called them and asked about the parts, a guy told me that he was not sure whether they had stock at all. They had stopped using that supplier from U.S..
Third, when I asked when they would re-stock, or did anybody knows more about their 1911 parts, the guy promised me that he would get somebody to call me back. Nobody called.
I got so frustrated that I just ordered the aftermarket parts directly from Brownells. Although they were "international orders", it just takes about the same time as ordering from the super slow Marstar anyway.