I have one of these and I have a tan G&G GR15 raider CQB I have one of the gearboxes stock and I have one fully upgraded and I just interchange the upper recievers back and forth. When I put the DMR upper reciever with the tight bore long barrel on my upgraded gearbox this thing shoots far and accurate. Big diff from the short tight bore upper reciever I have. I usually have one on the back of my vest so that while I am in the field I can throw my long barrel on and take long shots and then when I get ready to run I can put the short barrel on and be quicker. I can do this in the bushes in about 35 secs. I love these guns.
One pin to change the upper reciever
upgraded these guns are amazing
Don't listen to the haters these are LIPO ready.
I ran a king arms lipo on this stock for 3 months with no probs.
I know have it fully upgraded with a magnum motor and this thing rips.
when taking apart the gearbox getting it back together is a pain in the ass.
You should let the pros do it I have been doing this for a while.
The gearbox thing really isn't a con since you should let the pro's do it.
Rating: [5 of 5 Stars!]