Hi, welcome to Gun Disassembly Wiki! Thanks for your edit to the File:Weapon achievements-square-indexed.gif page.
Hello, I'm not very familiar with wikia, so I don't know if you're seeing my responses in my talk page. Just in case you are not, I'm leaving a message here.
I see the MG 3 (MG 42) on the map now, beyond the Mauser C96, and can confirm that the unlock cost is 25,000 + 7 credits. I've reverted my change to the wiki, and changed the main page for the gun. Thanks for fixing the numeric sorting of the gun table, and adding the missing values.