Summary Bought an Amoeba CCP, low energy high rof - perfect for night games. But well, the B&T Tracer doesnt fit in the handgrip. So i stole the threads from the 2 named sources (because iam to dumb to make them ^^ ) and made an adapter/extension for it to fit. Could be a little bit shorter as you can see but it works! How good the threads get highly depends on your printers quality, heaten the barrel with a lighter, srew a little bit in and repeat if you have problems. Of course you should clean the inner pipe carefully so no remains are in the BB´s way and you have to make sure its halfway straight so the BB´s dont touch the adapter ... or you use a longer barrel. Works fine for me ... Our youtube channel - leave us a visit ;-) https://www.youtube.com/user/vhwie Sources: http://www.thingiverse.com/thing:1238793 http://www.thingiverse.com/thing:292499