Nope, its based on the receiver.
The only thing I did to mine initially was downgrade the spring. But then I pimped it out for a high speed ROF setup, as well as a tuned up drum magazine to keep up with the thing.
Also popped on a PKA sight for it just to make it look crisp
.
Theres nothing wrong with the folding stock style... I actually wish mine was like that time to time.