Now, first off: I do not want civils being allowed to get every gun in the game, nor do I want them to be able to get them for absolutely free.
How it would work is, FP fill out an application similar to the Driver’s License application on the regulations around firearms. If they pass this application, they would receive a Firearm License, which would allow them to purchase firearms at a vendor. Ideally the firearms they can obtain would be relatively weak.
Along with the addition of this vendor, the ability to buy a light vest would also serve nicely.