When I was playing through last night I got a weird bug where the Steltek gun got installed overlapping one of my Tachyon cannons. I usually sell one of the Inner cannons before the ES missions (generally Inner Port because it's easiest to grab) so that the Steltek gun is installed in the empty slot (Inner slots are a bit better angled for firing), but for some reason the Steltek gun was installed on the Inner Starboard side, overlapping the Tachyon cannon. This causes the game to crash if you enter the Upgrade and Repair room. It probably can only be fixed through editing the save file, but it otherwise functions correctly so as long as you don't have to buy any missiles or repair after picking up the gun you can still finish the game. Something to look out for.
