No, I didn't had time to do further testing (I based my conclusion on the fact this weapon seems to work on other craft). The ship I'm flying has a turret, but it doesn't use $Substitute (and this turret gun also works, while it's installed on other ship). In fact, I don't think there was anything else that could cause problems. The weapon was a gatling gun (with spinup) and the ship used Chief's weapon linking (which works with $Substitute). I now suspect the spinup, which could have caused a crash on release build, on a different weapon (I ended up not re-checking it on debug due to lack of time). I'm sorry my testing was so lax, but tommorow I'm going to a paramillitary camp and I had to pack everything, so I was quite busy.