Upload your image to an image host like imgur, tinypic, etc. and use the [ IMG][ /IMG] tags to hotlink them.
As for the part you're describing.... I'm assuming you mean the little plastic piece in the magazine that stops the BB's from being pushed out all at once? If so, you're SOL and need to buy a new mag (or at least I haven't found a replacement part for that). Also pretty sure they're all plastic.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE