Plastic or metal don't make any differences. If by plastic your "source" meant *clear* receiver, there might be a slight diff as it *may* fall into a different category when it comes to gun classification (replica vs uncontrolled firearm vs whatvever)
But all in all it doesn't change anything. 300fps is still 300fps no matter what shoots the BB, right?
But more importantly, I have to ask, despite my answer: what do you mean, or what is it you want to know exactly?
Originally Posted by Brian McIlmoyle
Real life comparison,
GBBR- bang bang -- Giggle
AEG-- merrrzip merrzip -- meh