Miner Ship with Iron Hammers not working

[=RedDwarf=]

I am having some trouble with a new ship that I purchased. It is the DU5-7Y "Hegemon" Asteroid Miner. It was listed as a Miner when it was purchased. I had intended to purchase a Bounty Hunter Gunship but changed my mind when I saw this. That left me with the ship on the wrong character than I had wanted.

Onto the actual problem. I have purchased a few weapons in order to defend myself. I do not wish to recruit others with fighters to assist. Finding weapons that are usable has proved very difficult so far. They all have a very low refire rate. The best that I have found is the Iron Hammer and other similar weapons with the same specs. I purchased 2 of the Iron Hammers and left the station.

The Iron Hammers will not fire! Either when grouped or singularly using their key. I have been in and out of a few stations with the same result. I have unmounted them left the station and then re-entered and re-mounted them with the same result.

Do the Iron Hammers work on this ship? Why am I have these problems?