Thought I share this Magpul Masada with you guys. I changed the spring to M140 and use 11.1 V Lipo battery. So far it works and FPS is around 468. I used it for training purpose only
Surprisingly I bought the Halo GemTech 2011 model, it fits with a slight gap. Bought it from airsoftparts.ca from Toronto.
Please let me know what you guys think or how to improve. Thanks.