Thanks for the information. I will post more pens as I get some better pictures since right now the only good camera I had was a phone and it died permanently. I am always working to improve the pens I make as well as figure out new ideas. I am currently still trying to figure out the .556 round into a pen. I have done 308, 30-06, and .762 with varying degrees of success. I do say success because they functioned as intended.