This raised two issues. First of all, because I bought 2, i didn't get the prompt to install the weapon, thus I went off into battle only to realise I didn't have any launcher installed at all.
Secondly, the game should know that you will never use more than one unit of a weapon. There is no point in buying two identical Dual Laser Cannons or two NAMI launchers, unless you are going to sell them (which is valid).
However, just like there is the "would you like to install this as well" prompt, there should be a prompt when buying two (or more) identical weapons in one transaction that says:
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"Whoa kid, you going to fight a war or something there? You sure you want to buy % of those?"
This cannot be done for anything other than shields, weapons and launchers -- obviously you always want more than one of anything else such as missiles, fuel rods etc.