Your purchase was successful. You now have 200 Credits and an Ashwinder in your inventory. Though it has no ammunition, so you might as well buy some Buck Slugs from a Gunz For Funz.
The cashier jumps in excitement, and quickly snatches the Ashwinder from your hands to examine it.
"Holy shit... Where did you find this?" he asks, astonished.
"Alright."
The cashier quickly ducks under the table to bring out two Buck Slugs on the counter.
"Now where can I find another one of those things?" he gestures toward the Ashwinder.