This is a part of a bigger project: http://www.thingiverse.com/thing:461896 Feel free to modify frontset - it should be better and constructive. Just send me link when you design a new one. This frontset has enough place for MOSFET key (over inner barrel) and 7.4v Li-po accumulator. Parts ==== No external parts needed, but you have to build other parts of gun before to ensure good placing of frontset. Assembly ==== Print all parts and remove support. Glue left and right middle parts. Glue barrel and flame suppressor, make sure internal barrel fits into hole. Glue middle parts and barrel. Glue "left" to "left back" and "right" to "right back". Glue all parts.