i need help customizing a Spectre M4 RPD

[brettapuss]

hi recently i bought a spectre m4 RPD and ive been looking at other peoples spectres online and they all have rear mounted sights or front mounted sights with different stocks etc etc and i have absolutely no idea where the hell i find any of the rail systems they're using in some of these pictures 
https://gyazo.com/ed4074520bbcc7882f2de20544f01c04 
https://gyazo.com/1b07b4f347551fc78abb2417d448066c
https://gyazo.com/cd3dc6b63d52d1d2919aaf3a3320803c

i have things like the red dot sights but i dont know what kind of mounts or rail systems i need to fit them on 
so if someone could please tell me what i'd need to have a front sight like in the first pic, a stock like in the second pic and finally a rear site like in the third pic. 

if anyone could link me to at least one of these things so my gun doesnt look so plain and boring because its driving me insane that i cant find any of these parts anywhere i literally have no idea what im looking for

 

[Hangtight]

https://m.dhgate.com/product/mft-tan-black-mission-minimalist-hunting/407830410.html#s2-24-1;searl|3423402389

There's your stock...

 

[springs]

the stock adapter you can get on shapeways. this will allow you to fit a M4 buffer tube.

if you want a silencer or something else on the front then you need to get the echo 1 threaded outer barrel which as far as i can see is only for sale in america. i've found it on airsoftGI i believe. it's cheap but you'll get stung on shipping.