What do you think of my writing? How can I improve?

I like the story and the dialogue so far. Your grammar needs some touching up though. For example, don't put spaces after quotation marks, and use commas before and at the end of a quote. ie: Baggs chanced a glance back to Curtis and said, "Don't forget your gun," and with that blah blah blah. And a couple of sentences just sound awkward. Read it aloud and see what doesn't flow. It seems interesting, but little mistakes distract from the overall effect. It has potential.