Having been in love with the MP5 swordfish since i discovered it, I have always wanted something similar for the G36. So I ended up making one.
Made for airsoft G36 with the JG RIS front for G36K. Two spacers are included one with counter clockwise thread (CCW) and one with clockwise thread (CW). Test fitted on a Umarex G36 with a C-barrel, but should fit JG, TM, etc, as long as the barrel is C-length. for a K-lengt barrel you have to widen the hole in the RIS attachment part so that the outer barrel can go through.
Printed in PETG, raft, supports everywhere, but you know your printers better than I do.
Created with Fusion 360.
Wanhao Duplicator i3 Plus
The hammer face plate it printed separately and needs to be glued onto the RIS mount.
Barrel spacer should not be glued, it just slides on and gives a decent seal.
If you like you can glue the swordfish attachment to the RIS, but it should stay in place fairly well just by friction.