its a walmart gun painted black, you won't be able to find any replacement parts for it. simply because its not 1:1 scale. as for the gun type, its a M4 with a M16 shorty stock. too bad its small and won't be anywhere near real scale.
"You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here."