Tehehe... no problem, lad. Remember to check the sprites once in a while or to save these ones coz I sometimes edit the sprites already done at random. Well, not at random, it happens when I feel like tweaking them.
Also, I have something similar to your subtype weapons in my dreamed X-Com. Weapon Modifications. Basically, they add or change functionality in weapons. They also get a partial name change.
Burst Mode: Add Burst Shot to Pistol and Rifle Class Weapons / Prefix added "Assault"
Optical Scope: Better Aimed Shots for Pistol and Rifle Class Weapons / Snipers can aim at Body Parts / Prefix added "Scoped"
Laser Sight: Slightly increases Acc for Pistol, Rifle and Heavy Class Weapons / Prefix added "Laser-Sighted"
EMP Mode: Plasma Weapons gain the Ability to fire EMP bolts / Name replacement "Plasma" to "EMP"
Stun Mode: Plasma Weapons gain the Ability to fire Stun bolts / Name replacement "Plasma" to "Stunner"
As you can see, these would be like Subtype Weapons too.
Also, the EM Guns I posted do not exist in my dreamed X-Com. The EMP Mode makes them redundant items. I made the sprites for them anyways.