Bought myself an extended mag. Used it on my Weathered 10mm and this is what i get

http://i.imgur.com/T6qvF.jpg

http://i.imgur.com/M27Iy.jpg


Still the same after restarting the game.

I think they didnt even made a model for the weathered 10mm with mods

That symbol signifies that the game can't find the model for the item. When you first start the game, in the launcher, click Data. Make sure all of the check boxes are checked and then start the game.

Nope. It doesnt work . Everything is checked(Load loose files keeps unchecking itself) and it stills does it.

Got back to an old save and tried it again did the same thing.

It's not doing that with a normal 10mm

It sounds like you have found a bug then. You either need to wait for them to correct it, or perhaps a modder will get to it first.

It does, indeed appear to be a bug. The Weathered 10mm does this when you attach a silencer or a laser sight as well.