Abe Sandrich is the ancient firearms expert called in by Beckett to consult on the case in "Punked". Mr. Sandrich clearly has a passion for his chosen line of work, and is quick to point out to Beckett and Castle that under the right circumstances these older guns can kill just as easily as their modern counterparts. He corrects the detective's use of the word 'bullet' in this context, pointing out the more appropriate nature of 'lead balls'.