A recent thread mentioning speed-loaders got me thinking... SR4 is still missing one of the big, real-world tricks that people use for loading revolvers; Moon Clips. Essentially, they're a thin daisy-wheel that clips a cylinder-worth of cartridges (usually rimless) that holds them together as a coherent unit, effectively making reloading a revolver as fast as changing a clip on a semi-auto. It has no slots because it's an extremely simple modification, even compared to most 1-slot mods from Arsenal.
So, I present to you this:
Weapon Mod Slots Threshold Tools Cost Availability
Moon Clip Conversion -- 10 Kit 200¥ 2
Effect: Moon Clip Conversion can only be applied to weapons with a Reload Type of (cy). A weapon modified with Moon Clip Conversion has had the cylinder altered slightly, so that it can accept ammo that has been pre-loaded into a Moon Clip. Calculate reload speeds as if it were a Reload Type (c) whenever using Moon Clipped ammo, including gaining benefit from Smartgun and other upgrades that affect Reload Type (c). Weapons modified with Moon Clip Conversion may still be reloaded normally, using loose ammo, following standard Reload Type (cy) rules.
Firearm Accessory Mount Availability Cost
Moon Clip -- 2 5¥