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It's not possible to remove that weapon, there for a different one can't be mounted.
And sorry say this, but that weapon is useless. 20 minutes continuessly fighting a pirate ( mouse controlled ) and just two accounted hits to the enemy. For godsake he had the same bad weaponry :D
My initial guess is that you are currently docked at a location that doesn't have a tech level high enough to buy/sell that particular item. The Equipment Market screen only shows your ship's sellable equipment. This is not a complete list of all of your ship's equipment; it only shows those items up to a tech level that starport supports. For example, London (Tech Level 3) does not show a starting Sinonatrix's Class 3 Hyperdrive. For a complete list of ship equipment, see the Ship Information screen.
Have a look at this PR for a bit of background (not sure if the data there is current).
I just fired up a new game at Mars with a Sinonatrix on the following Pioneer versions (on Windows), and was able to sell the Sinonatrix's fitted 1MW Pulse Laser at both Cydonia (Tech Level 9) and London (Tech Level 3):
Re: your comment about the fitted pulse laser being useless... Well, yes. It kind of is, until you get to the point where you know how to use it. I'm not there yet! Which is why I'm more of a space-based APC, ferrying high-risk passengers between systems most of the time. My suggestion: try the new beam lasers.
Does the laser show up under Ship Information? Wondering if it has maybe been destroyed..? You did say you experienced prolonged combat... I know when a hyperdrive blows up (because it's not been serviced), it becomes its weight in rubbish...
I count 18 tons of listed equipment on that screen, and 35 tons used total... Does that look right to you, e.g. 17 tons of cargo? Any of that rubbish?
If you start a new game on Mars, can you sell the laser?