AEG77, how did you mod the sides of the receiver where the butt-stock rails slide to make it concave like that? That's so well done that it does my head in! I have an airsoft EBR butt-stock and I want to mod my Taidi EBR to accept the rails but I can't figure out how to do it - would you please enlighten me...

BTW thx styeraug - always learning, learning...never finished!
Well for this mod you need to spend quite a fair bit of time. First you need to cut or saw off the existing plastic rail. If u have a dremel cutter it'll be simpler. But if u don't like me drill a hole somewhere in the middle put the hacksaw blade thru and cut. Watch the end where the handle is. Sand it down to a semi circle to fit the rail.
Now use epoxy to form the concave area where the rail slides. U can use a slightly larger dia tube as a mold. Then sand it off.
Drill a hole on each side above the handle part. Sand down. Now insert the rails thru. You'll figure out. I hope this helps..