Upgrading the De M89p ump

I am having a hard time finding a website for upgrading the de m89p. Is there a kit that is made by double eagle specificly for this gun?

pleas respond

questions on the Well MB04

I have some questions about the WELL MB04 G-22 AWM .IWELL MB04 G-22 AWM. Ive been hearing different things about the fps, anything from 400-500 what is it with .2g bbs? Also, i was looking to install a new spring. Tell me if either of these will work in this gun.
Systema M170 spring or the Guarder M150 Spring. Also, where is the best place to buy (not airsplat.com) that place is unrealiable.

Please Reply!