I would not do ANY business with Preferredcustoms. I bought one of the custom M1A stocks from him and had some minor issues with it. I tried to talk to him about resolving these issues and even provided my phone number so he could call and discuss them. I called and left messages, but was never called back. We had no problem corresponding when I was buying the stock, but when I had some issues, the correspondence stopped abruptly.
I sent the stock back for a refund and didn't hear back from him, nor get a refund. I've sent him many, many e-mails and PMs and only got several e-mails back - all filled with profanities. His last e-mail simply stated "Blow me".
Never got my money back - he stole $150 from me.
There are better dealers and better stocks out there. -- BEWARE