Wade Yarbrough, 37, of Thomson, a clerk at Double D Gun & Pawn, was unloading his gun when it fired about 11:30 a.m.
Monty Ashcraft, the owner of the shop at 642 Main St., said the injury did not appear to be life-threatening.
Yarbrough’s son Dakota Yarbrough, 16, said his father will need surgery.
The bullet lodged in a shelf and was recovered.
Thomson police investigated but had no information available.