Generally, I dry fire my guns very little.
With gas guns it's not such an issue, but it becomes more of a problem with AEGs. BBs provide a small amount of back pressure in the piston chamber when the gun is fired. With nothing but air blocking the chamber/barrel, and an AEG is dry fired, you're just smacking internal parts togeather... at high speed. This eventually leads to breakage.
Gas guns like I said, I've not dry fired over much. Full metal versions will withstand wear and tear better than plastic guns will, and the type of "green gas" you use will also vary the wear/damage your gun will experience.
For instance...
Most Japanese guns (and some Tiwanese as well) are designed to only use HFC134, which is a less powerful gas. Using '22 gas in a gun designed for '134 gas will introduce eventual damage. Minor damage can result in simple blown seals in the magazine. Major damage can be something like the front of the slide blowing off, sending plastic slide parts sailing at high velocity. I've seen it happen. It's interesting, but not fun. 
Most Hong Kong manufactured guns (KJW for example) will use the standard Green gas (HFC22) right out of the box with no excessive wear damage.
Above HFC22 on the power scale is Red Gas, and above that is Black Gas. I don't know what the chemical contents of that stuff is, but it's only used by heavily upgraded guns overseas.
Standard CO2 which is used in the 12 gram cylinders in some newer airsoft pistols is stronger than HFC22, but less than Red Gas. CO2 requires either an outboard hose rig or a custom magazine to use.
Most gas sold in the USA is HFC22, and is commonly referred to on eBarf as "Green Gas" although the term can be used as a generic descriptive for any gas used in an Airsoft gun.
Now I've seen Marui pistols (M9's for instance) handle US Green Gas ('22) with no problem. One player even stress tested his Beretta for about a year of skirmishing by using Green Gas only, and he also never lubed the gun. Last I heard it was still in one piece. I've seen guns made by other companies however blow apart after a few months of using HFC22. Your actual mileage may vary.
and as Spat said...
Quote: Quote:If you dry fire it a lot, you will need to take it apart and clean and lube it just to make sure it keeps working well over time.
Truer words were never spoken.
Russ
"Time has little to do with infinity and jelly doughnuts."
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