Renton has sent over details of a hop-up set by STINGER for the WE M4 GBB series. I managed to find what I believe to be their website here, which lists the install manual. At the moment contact details are via email and they are looking for distributors around the world:
NEW WE M4/M16A3 Hop-up Set from STINGER
For those who own WE M4/M16A3 but end as just a delicate wall mount on the wall, due to the original Hop-up could not perform well. STINGER Work Studio Taiwan has a new total solution to solve it eventually. With new design of the adjuster and Hop-up bulking, you could easily adjust the HOP-UP according to the pellet weights or what trajectory they want. The new designed HOP-UP bulking could also keep the pellet in straight and stable compare to the original version.
Features:
1. Easy to install and use in WE M4/M16A3
2. Truly adjustable HOP-UP
3. HOP-UP bulking with special design & of high hardness material
About STINGER Work Studio is a trade mark in Taiwan which has experienced mechanical engineer who has been engaged in mechanical and tooling for almost one and half decade. Innovation and convenience is what we want to provide to airsoft players.
We are looking for Distributer/Dealers for all over the World / Regional.
Contact Person: Renton (Chiahsiang) by evan.cloud@msa.hinet.net