Lovely daughter HG. I am certain that you are one proud papa.
Having raise three daughters you don't have to be cleaning the guns. Just get real close to the boy, look him right square in the eye, and talk low and slow about how much you care for your daughter. Those young boys are easy to intimidate and it is one of the fun things a dad gets to do.
Years ago I told a kid who started dating my middle daughter that he should come help work some calves. I told him that any boy who was going to date my daughter should know how fast I can castrate a bull calf. Him and the daughter will both be 30 next month and I think he is still scared of me.