or previous owner might have changed out springs or parts which would effect the trigger pull. >> let me stop you right there. do you know if anyone other than michael dunn owned that gun? >> i don't know. >> did you do a history on the serial number? >> that's not my job so i don't know. >> is the serial number clearly marked on the sghun. >> yes, it is. >> you guys at fdle have specific computers and technology to track guns, correct? >> we are not the ones that would run a serial number. >> you said it is not your job, though, correct? >> not something i would do. >> you didn't do it. in this case, did you ever take the gun apart? >> no. i believe i probably field stripped it to take the slide off and check out the safety. >> when you field stripped it, did you check to see if the trigger was ever modified, customized, made to be what we call a hair trigger, anything like that? >> no. i was looking specifically at how the safety was functioning