Real G36c guns have a plastic body. The Airsoft versions, being cosmetic copies of real weapons, utilize plastic for the bodies as well. Just because it's plastic, don't let that discourage you. Tokyo Marui's, for example, have all the exposed metal ...
You mean you want to take a stock off an airsoft and put it on your 10/22? There's not much anyone here can say without knowing the exact particulars. Cut that part? Glue right here etc? You're going to have to look at your own intended stock and see...
Any airsoft gun will fire 6mm .30 or .35gram metal bb's, but only high powered ones will do so with any power or distance. Only guns rated at 400+ FPS will throw the metal rounds well. Guns made by ICS and Classic Army can be upgraded to 400-450 FPS,...