Hi folks, I'd like to share a thingi I designed for my own purpose. It's an adaptor to mount a standard M4 grip I bought (Panther Sniper Style) to my ASG Urban Sniper Rifle (also known as Well MB-06 and ASR Echo 1). It consists of two halfes (left and right one) and uses 4 pins (mandatory; diameter 2 mm, length 4 ... 6 mm) and 2 new screws with nut and washer, M5 (I used M5 x 30 hexagon head). Maybe you need to do some minor adjustments, depends on the grip, you're planning to use. Feel free to use, develop the thingi and comment or like. ;) Have fun! PS: I mounted it succesfully but have not yet field- and long term-tested it.I used a student version of SolidWorks 2013 to create it. Great software. I just measured the parts and adapted the original part, to which the standard grip was mounted. Just print/order the two (!!) halfes, put the nuts in it and you should be ready to go.