UDDER GAMING

So I bought an Off road DSHKM because why not and tried to rearm it at a Gas Station. It gave me the option to when I was in the gunner and it said the rearm was free (Which I find weird but thats no the point) When I then clicked on the option a message popped up on my screen saying I needed 0 coins to rearm and the DSHKM was not rearmed. At the time I had 12,500 coins on me. I have yet to try it with 0 coins on me, and I have tried at multiple different gas stations.

Thank you for letting me know. I will fix this asap. This is occurring because I must have failed to define a price for the DSHKM ammo at the gas stations.