You can purchase a copy of Six Bylets the debut novel by Mark Colt at these retailers.
Barnes & Noble https://www.barnesandnoble.com/w/six-bullets-mark-colt/1139091687?ean=9781777320706
Mark's Youtube Channel https://www.youtube.com/channel/UCHR3tYp38JZxgCRjiIueztA
Mark's Goodreads Profile https://www.goodreads.com/author/show/21298861.Mark_Colt