Just know there is an extra % fee if you pay with CC. It's in the small print and Mark doesn't mention it when you call to order. It surprised me when I bought a Gen2 G19 from him.
He's a good guy and won't intentionally do you wrong. In fact, I do recommend him. Just make sure you know this .... I confirmed my "total" several times on the phone but that wasn't what I was charged. I was charged that "total" plus a %. The receipt enclosed in the box to my FFL included my CC number written across it. Luckily, my receiving FFL is a buddy of mine and not a stranger.
Again, this is not a bash ... just a heads up. I do recommend Mark @ Summit Gun Brokers.