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Piston short stroking is a well-known technique that helps increase ROF. The logic is simple: decrease piston
cycling time by removing teeth from the piston and the sector gear.
Advantage? Less stress on the gears, the motor, and the battery. Gain?
One sixteenth rps per every tooth removed. Loss? 15-20fps per tooth
removed.

 
Short stroking is done by removing teeth from the piston and the matching teeth from the sector gear.

 
First, the piston.

News that just came in this week that KWA USA is releasing an M4 AEG that was made especially for Close Quarter Battles.... "Rosemead, CA – November 1, 2007 – KWA USA today announced the introduction of a new AEG, the KWA KM4 CQB Carbine. The new AEG was designed and engineered specifically for close quarters battle scenarios where low velocity and high rate of fire is required.

Aegarms, a Hong Kong based manufacturer, wholesaler and retailer of all airsoft related product, has the G&P M16A3 With M203 available. AEG products range from AEGs, Grenade Launchers, Shot Guns, Rifles, Spring Guns, Pistols, to Accessories such as Plastic Parts, Metal Parts and Combat Gears.