Yes---Brownells---I forget if they are 6-48 or 8-40 screw thread:Brownells
"just take the gun in" to Ace Hardware....reminds me of a "desk pop" (see link below)Ace Hardware has them for something like 40 cents. I can't recall the size off the top of my head, but I carried my (unloaded) rifle in the store the first time. Bought about a dozen of them to have on hand. Cheaper than having them mailed to you for sure.......something like a 6x28 or so. Just take the gun in. Good Luck!