The reason I ask is that I was thinking about building an HPA rifle with the GR16mod5, but was told by someone that it might be a problem to convert the gearbox in that model. It has the ambi bolt levers, so I was interested in trying to use the stock gearbox to keep them.( If only Aesthetically).
Thanks anyway. Just thought, of anyone, you might know.
I ended up with the VFC HK 416a5, because P* had that rifle listed as a proven platform. But figured, as you are now repping the Arcticus line, you may know.